Things the GMAT Does Not Like: “Because of” + NOUN + -ing

becauseSince the word “of” is a preposition, when we add it behind “Because” it limits what we can have afterwards to a noun.

On the GMAT, “Because” and “Because of” are NOT interchangeable!!!

We use “Because” to describe an entire clause. For example:

CORRECT: Because Ft. Sumter was attacked, the Civil War began.

The bold section (everything between the “Because” and the comma, is an independent clause and could stand on its own as a complete sentence. The word “Because” is describing that entire action. BECAUSE this action occurred, something else occurred.

Let’s look at the sentence if we tried to use “Because of” instead of “Because”:

INCORRECT: Because of  Ft. Sumter was attacked, the Civil War began. 

Hopefully you can hear just how “wrong” that sounds! If we’re describing an entire action and using an independent clause, we need only “Because.”

“Because of” should describe a NOUN only. 

CORRECT: Because of his complete lack of remorse, the criminal was given a harsher sentence.

“His complete lack of remorse” is a noun phrase, so “Because of” is used correctly.

One thing the GMAT does not like is sentences that attempt to use “Because of” + NOUN + an “-ing” verb. This construction is incorrect, since, as we have seen, “Because of” is best used with just a noun.

Example: “Because of the Senator attending the event …” = WRONG!
Example: “Because of the girl winning the sports competition…” = WRONG!
Example: “Because of Alex getting a 700 on the GMAT…” = WRONG!
Example: “Because of the cat sleeping all day…” = WRONG!

We would want these ideas to be expressed with just “Because,” and change the verb to make logical sense:

Example: “Because the Senator is attending the event,…” = RIGHT!
Example: “Because the girl had won the sports competition…” = RIGHT!
Example: “Because Alex got a 700 on the GMAT…” = RIGHT!
Example: “Because the cat had slept all day…” = RIGHT!

Let’s look at a practice question that uses this structure:

Because of the broker having a portfolio of losses, he will most likely be let go from the firm.

(A) Because of the broker having
(B) Because of the broker having had
(C) Because the broker having had
(D) Because the broker has
(E) Because of the broker had been having

(A) and (B) both attempt to put the participle (-ing) verb immediately after the noun “the broker.” The GMAT does not approve of this! Therefore, (A) and (B) are incorrect.

(E) is also incorrect (not least of all because its verb tense makes no sense).

Only (C) and (D) are options. They now use “Because” so what follows must be an independent clause. Let’s examine both sentences, and highlight the section between the “Because” and the comma:

(C) Because the broker having had a portfolio of losses, he will most likely be let go from the firm.
(D) Because the broker has a portfolio of losses, he will most likely be let go from the firm.

Only (D) puts something that could stand on its own as a complete sentence after the “Because.” Therefore, the correct answer is (D).




Arithmetic and the GMAT

Random pile of colourful plastic lettersThe branch of mathematics dealing with the basic manipulation of numbers is called “arithmetic.” On the GMAT, Arithmetic questions have to do with solving equations and expressions by moving variables from one side of the equation to the other.

Sometimes this involves conversion, or describing one variable in terms of another. Let’s look at an example from the OG:

Temperatures in degrees Celsius (C) can be converted to temperatures in degrees Fahrenheit (F) by the formula F = 9/5*C + 32. What is the temperature at which F = C?

(A) 20°
(B) (32/5)°
(C) 0°
(D) -20°
(E) -40°


The question is asking what is the temperature at which F = C. For this question if, F = C, then wouldn’t F = (9/5)C + 32 be the same thing as C = (9/5)C + 32?
If C = (9/5)C + 32, we can start to simplify by subtracting (9/5)C from both sides.
C – (9/5)C = 32 is the same thing as:
(9/9)C – (9/5)C = 32
(-4/5)C = 32

Let’s multiply both sides by 5:

-4C = 160
C = -40

The correct answer is (E).

Factorials (!) and Divisibility

exclamationIt’s amazing how something as simple as a (!) symbol can throw us all for a loop, even when really we’re just looking at a very simple divisibility question. This is my own question designed to mimic a GMATPrep question.

Start by setting a timer for 2-minutes and try this one on your own, then scroll down for the explanation!

Which of the following is an integer?

I. 10! / 3!
II. 9! / 8!
III. 13! / 11! 5!

A) I only
B) II only
C) III only
D) I and II only
E) I, II, and III


If the result of a fraction is an integer that means that what is in the denominator divides evenly into what is in the numerator. The question for each of these Roman numerals becomes: will the denominator go evenly into the numerator?

Since we know that 10! = 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1, and 3! = 3 x 2 x 1, it is obvious that the denominator of Roman Numeral 1 will go evenly into its numerator.

This same logic can be applied with Roman Numeral 2. As long as the factorial in the numerator is larger than the factorial in the denominator, then we will get a resulting integer.

Roman Numeral 3 is more complex. If we start by cancelling out the 11! from both the numerator and the denominator, the resulting fraction becomes:

(13 x 12) / (5 x 4 x 3 x 2)

Since 4 x 3 = 12, we can cancel those values out:
13 / (5 x 2)

Now we are stuck. 13 is a prime number, so neither 5 nor 2 will divide evenly into it. The result will be a decimal.

The correct answer is (D).


CR Weaken: Why We Need to be Flexible

With Weaken questions, we need some flexibility with the answer choices, since there are several ways to weaken an argument:

-Provide an explanation
-Prove the assumption is wrong
-Undermine a piece of evidence

I find the easiest “default” for a Weaken prediction is to identify the Evidence, Conclusion, and Assumption of the argument, and then simply reverse the assumption.

The hard part is trying to do all of this in your head, so I HIGHLY suggest you do all CR work on your scratch pad. No need to write the entire argument down. You can easily summarize it with abbreviations and symbols. Let’s examine a question:

Microbiologist: A lethal strain of salmonella recently showed up in a European country, causing an outbreak of illness that killed two people and infected twenty-seven others. Investigators blame the severity of the outbreak on the overuse of antibiotics, since the salmonella bacteria tested were shown to be drug-resistant. But this is unlikely because patients in the country where the outbreak occurred cannot obtain antibiotics to treat illness without a prescription, and the country’s doctors prescribe antibiotics less readily than do doctors in any other European country.

Which of the following, if true, would most weaken the microbiologist’s reasoning?

A) Physicians in the country where the outbreak occurred have become hesitant to prescribe antibiotics since they are frequently in short supply.
B) People in the country where the outbreak occurred often consume foods produced from animals that eat antibiotics-laden livestock feed.
C) Use of antibiotics in two countries that neighbor the country where the outbreak occurred has risen over the past decade.
D) Drug-resistant strains of salmonella have not been found in countries in which antibiotics are not generally available.
E) Salmonella has been shown to spread easily along the distribution chains of certain vegetables, such as raw tomatoes.

Here, the evidence tells us a prescription is hard to get, so antibiotics aren’t to blame for the salmonella, even though the salmonella were drug-resistant.

The bad logic here is that the author is assuming there isn’t ANOTHER way that antibiotics could have caused the salmonella, just because doctors don’t give out prescriptions.

So, to weaken, let’s reverse the assumption: what if there was ANOTHER way that the antibiotics contributed to the salmonella that didn’t involve doctors???

Notice that once we’re crystal-clear on the argument, the correct answer is much easier to spot.

B) is saying the salmonella could have come from people eating animals who eat antibiotics. Maybe it transferred?

This is a solid option, and a good reversal of the assumption.

Many students, however, will eliminate (B) right off the bat, because they will think, “huh, I didn’t read anything about “animals that eat antibiotics-laden livestock feed.” But remember, Weaken questions can be exceptionally difficult, and since there is more than one way to weaken, we have to be open to the idea that the correct answer may introduce a detail that at first seems totally irrelevant, but after a few seconds reveals itself as something that destroys the conclusion.

The author said it is “unlikely” that antibiotics could be blamed BECAUSE of the doctors not giving prescriptions.

BUT, if the people are getting antibiotics from a totally different source, then yes, the antibiotics could still be blamed.

Here is how our analysis could have looked for this question on our scratch pad:


Remember to make a prediction for a “Weaken” question on your scratch pad, but ALSO be open to the idea that the correct answer might weaken the argument in an unexpected way!

3 Reasons You Need to Use Your Scratch Pad for Sentence Correction

It is incredibly common how many GMAT students have ZERO strategy when it comes to Sentence Correction. Most students just read (A) and try to see if something “sounds weird,” then continue on to (B), (C), (D), and (E), often reading and re-reading each of the 5 choices until they choose what “sounds right” to them, or which one they like the “best” out of the 5. This is NOT a time-efficient or accurate way of doing Sentence Correction! Let’s look at three “home truths” we need to digest in order to move our grammar skills from “okay” to “foolproof!”

High-scorers do not do SC on “feel.” It’s great if you read a sentence and you can sense something is “wrong” or “off” about it, but if you cannot pinpoint WHAT is wrong and WHY it is wrong, then you don’t know Sentence Correction as well as you think. Without writing down a GMAT reason, how do you know that the reason you are elimination Choice (A) is because of a GMAT error and not simply your own gut instinct?

If you don’t record your impressions, you can learn nothing from them. Let’s say you’re taking a full-length practice test. There are 41 questions in the Verbal section. That’s a LOT of questions!

Let’s say you missed Question #5 and it was a Sentence Correction. You go back to the problem a 2-3 hours after completing your practice test to review all your incorrect questions. You have some fuzzy memories of the specific question, but it’s been a few hours, and you did 36 questions after it, so of course you won’t recall it too distinctly.

You look at your scratch pad for this question and it looks like this:


What does this tell you about what you were thinking in your mind as you did the problem? Absolutely nothing. 😦

Therefore, you don’t really have anywhere to go. You can see you chose (D), but you don’t know why. How are you supposed to learn from the question? You read the official explanation, and some additional explanations from GMATPrep or Beat the GMAT, but they don’t tell you what YOU were thinking when you were working through the problem. Let’s say the correct answer was (E). You have no idea why you crossed it off. There is no record. So, how can you improve?

We don’t have Predictions for SC.  Sometimes students try to use symbols for their process of elimination. Symbols such as happy or sad faces and plus or minus signs are great tools to use for Reading Comprehension and Critical Reasoning answer choices, because we are comparing those answer choices to a pre-conceived idea, a prediction for what we think the correct answer will look like.

But, sadly, in SC we have no idea what the correct sentence is going to look like! Maybe it will look like (A). Maybe it will look completely different from (A).

Let’s say your scratch pad for our hypothetical Question #5 looked like this:

A ?
B –
C –
D +
E ?

This gives us a tiny bit more information about what we were thinking when we looked at each choice, but still not nearly enough. We aren’t thinking like the GMAT test-makers yet, because we aren’t “speaking” their language. They write answer choices to include these specific errors, so we need to be able to point out and name those specific errors. It’s the only way to achieve true Sentence Correction mastery. We have to think like the test-makers!

Now let’s say we DID try to apply our content knowledge of tested grammar/meaning errors to Question #5. Our scratch pad could reveal something like this:

B Para
C Mod
D Wordy?
E Para?

Suddenly, we have a LOT of great questions to ask ourselves:

• In (A), (B), and (C) was there really a Subject-Verb, Parallelism, and Modification issue? Did I recognize these errors correctly? What markers told me this error was present? Or did I miss the “real” error, and simply got lucky in my elimination?
• In (D), was there a grammar or meaning error I could not spot that made this choice incorrect? If so, what was it, and why couldn’t I spot it? What were the markers that indicated it was being tested? If there was no grammar or meaning error, was the only issue with this sentence the wordiness, or was another “style” error present?
• In (E), the correct choice, why did I invent a Parallelism error when no Parallelism error was present? What were the markers that made me think it was testing this concept, and WHY was the Parallelism actually okay? What do I need to remember about Parallelism so I can be more careful and not invent future Parallelism errors?

You will not be able to do this type of self-analysis without the knowledge of what your thought process was as you were attempting the problem!

Just because you speak English, read English, and feel like you generally understand English, don’t be fooled into thinking you don’t need to use strategy for GMAT Sentence Correction! It’s incredibly important for your growth and betterment, and my mission is to help you do it!

Conquer Even the Trickiest GMAT Main Idea Question

Sometimes a GMAT Primary Purpose or Main Idea question can be especially difficult. The passage may not be obviously informational or obviously persuasive, so how can we figure out the author’s point in writing it?

To start, let’s refresh the best 5-Step method for killing GMAT RC:

Proper RC Strategy

Step 1 – Read the Passage —> Do a Passage Map!

Step 2 – Rephrase the Question

Step 3 – Write Down a Prediction (Go Back to the Passage!)

Step 4 – Eliminate 3 Choices (Use “+”, “-“”, and “?” Symbols)

Step 5 – Carefully Compare the “Final Two”

Questions to Ask:

– Does the Wrong Answer Use Unnecessary Extreme Language?

– Is the Wrong Answer Outside the Scope of the Passage?

– Is the Wrong Answer Not Specifically Answering THIS Question?

– Can I Rephrase the Wrong Answer to Make It More Understandably Incorrect?

First, let’s re-format the passage so we can see how the author organizes it:

The fields of antebellum (pre-Civil War) political history and women’s history use separate sources and focus on separate issues. Political historians, examining sources such as voting records, newspapers, and politicians’ writings, focus on the emergence in the 1840’s of a new “American political nation,” and since women were neither voters nor politicians, they receive little discussion. Women’s historians, meanwhile, have shown little interest in the subject of party politics, instead drawing on personal papers, legal records such as wills, and records of female associations to illuminate women’s domestic lives, their moral reform activities, and the emergence of the woman’s rights movement.

However, most historians have underestimated the extent and significance of women’s political allegiance in the antebellum period. For example, in the presidential election campaigns of the 1840’s, the Virginia Whig party strove to win the allegiance of Virginia’s women by inviting them to rallies and speeches. According to Whig propaganda, women who turned out at the party’s rallies gathered information that enabled them to mold party-loyal families, reminded men of moral values that transcended party loyalty, and conferred moral standing on the party. Virginia Democrats, in response, began to make similar appeals to women as well. By the mid-1850’s the inclusion of women in the rituals of party politics had become commonplace and the ideology that justified such inclusion had been assimilated by the Democrats.

We’ve got two paragraphs, so I’d break them down on our scratch pad as below. I highlighted the keywords from the passage that stuck out to me and upon which I based my inferences.

STEP 1 – Passage Map

Topic: history fields
Scope: how they differ
1: to describe how sources/foci of fields differ
2: to exemplify how 1 field underestimates the other
Author’s POV: political historians (-); women’s history (+)
Purpose: to explain how 2 fields differ, and why that’s not (+)

Now we’re in a great position to try a question!

The primary purpose of the passage as a whole is to

STEP 2 – Rephrase: What’s the purpose?
STEP 3 – Prediction: to explain how 2 fields differ, and why that’s not (+)

A. examine the tactics of antebellum political parties with regard to women
B. trace the effect of politics on the emergence of the woman’s rights movement
C. point out a deficiency in the study of a particular historical period
D. discuss the ideologies of opposing antebellum political parties
E. contrast the methodologies in two differing fields of historical inquiry

STEP 4 – First pass:

A. (-) too specific to paragraph 2
B. (?) a little too specific to paragraph 2, but poss. long-shot
C. (+) potentially too negative in tone, but maybe
D. (-) the passage’s topic is not political parties
E. (+) a great fit for the first paragraph, but potentially leaves out paragraph 2

STEP 5 – Second pass:

The “final two” are C and E, since those are the only two options with a (+) mark. So let’s carefully examine the subtle differences between them.

C. point out a deficiency in the study of a particular historical period
E. contrast the methodologies in two differing fields of historical inquiry

Let’s rephrase each one:

C. show (-) in antebellum study
E. contrast HOW 2 fields studied

What it comes down to is whether we believe the ultimate purpose of this passage is INFORMATIONAL or PERSUASIVE. It’s tough, because the first paragraph is largely informational, and then the second paragraph is largely persuasive (it’s rare to see a passage so “split” like this, and this is not an actual GMAC passage, so we can have some healthy suspicion regarding its quality).

Which one should we choose, C or E? This is a MAIN IDEA question, and the correct answer must be the most broad choice that does not step outside the scope of the passage. Since the last half of the passage is persuasive, we could argue that the first paragraph only serves to drive us towards the author’s strong opinion. If we choose (E) here, we are not addressing the final paragraph at all. (E) is really more like the function of the first paragraph only. (C) best matches the overall passage and does an excellent job of matching the author’s point of view.

The answer must be (C).

Takeaway: If a passage seems “split” between informational/persuasive, look closely at the language of the concluding paragraph. Is the author trying to end with a decisive opinion? If so, it’s really a persuasive passage with some informational exposition. What really sold me on C is the strong opinion given in the first sentence of the second paragraph. The author really lays down a thesis, and then provides a detailed example to back himself up. He’s obviously passionate.

Remember to analyze the “final two” answer choices throughly. You can always rephrase them, consider the scope of each one, the specificity of the question-type, and look for extreme/qualifying language. Don’t just read and re-read answer choices as they are presented to you. Think critically!

How to Move your GMAT Verbal Score 40+ Points…In 2 Weeks!

Have you already gone through the Verbal questions in GMAC’s Official Guide, reviewed the MGMAT Sentence Correction book, and covered the Powerscore CR book? Feeling a GMAT Verbal plateau and not sure what to do next? Here’s some solid tips to move your GMAT Verbal score an extra 40 points in just under 2 weeks!

Beef up the grammar skills. You can ignore most of the challenging vocabulary on sentence corrections as long as you identify what part of speech each word is, and how it functions within the sentence. To do this, you’ll need to spend some time with a solid English grammar review book. I recommend pairing a heavy-duty review book, like the Oxford Guide or those published by McGraw-Hill or Longman, with a “fun” book like Writer’s Express or English Grammar for Dummies.

Read and listen to high-quality English publications. My recommendations include The New Yorker, the Atlantic Monthly, the New York Times, the Wall Street Journal, or any scholarly journal that you find interesting. Listen to NPR or audio books of English-language classics. Set a regular schedule for your reading and stick to it. Even twenty minutes a day will help you conquer Reading Comprehension.

Seek out Advanced CR for harder vocab words. Once you’ve practiced identifying the conclusion, evidence, and assumptions and are confident with the Critical Reasoning question types on the GMAT, consider buying an LSAT practice guide like the LSAT LR Bible. The LSAT has significantly more challenging CR questions and the format is the same as those found on the GMAT. Don’t neglect your GMAT practice, but if you can master the LSAT CR, then the GMAT questions will start to feel easier.

Go more slowly with Word Problems. Practice translating these questions from English keywords to Math equations. Be patient at first – these questions may be especially frustrating vocab-wise. Luckily, the common phrases such as “less than,” “is the same as,” and “product of” are easily memorized.


Identify the Conclusion, Evidence & Assumption(s). This should be your first step for all of the Critical Reasoning question types. The conclusion and the evidence will be explicitly stated in the passage, while the assumptions will require you to sit and consider the author’s point of view. What needs to be true in order for the conclusion to be correct based on the given evidence?

Find the purpose of each sentence. Sometimes CR questions will ask what the function is of a part of the argument. You may see questions that ask “which role” a sentence plays. Try to place it into one category: conclusion ,or evidence? If the sentence was removed from the paragraph, what would be lacking?

Know the overall flow. Arguments have a tendency to follow one of two shapes: a triangle or an inverted triangle. Does the author start by making a specific conclusion and then provide more general evidence, or does he begin with observations and then get to a thesis? Use variables to describe the structure. “Y leads to X which leads to Z” is different from “Y turns into Z unless Y is prevented.” Be on the lookout for “If X, then Y” relationship.

Paraphrase the argument. Dumb down the complexity of the argument as you read, as if you were explaining it to a child. You may want to write down a few short notes to help you. The idea is to ignore the petty details and see through to the author’s main point and to the evidence he provides to support his point.

Choose a verb. Questions about argument structure often ask about the “methods” an author uses. You already know the flow of the overall argument, now give it an overall purpose and label as an infinitive verb. Common verbs:

to explain
to dismiss
to theorize
to strengthen
to demonstrate
to revise
to assert
to suggest
to interpret
to reconcile
to challenge
to predict

Look for transitions. Transition words and phrases are like signposts pointing your way through the logic of the argument. They tell you what is coming next. “Specifically…” means a more detailed example will follow. “Thus,” means a summation is to be expected. “While this may be true…” is a phrase that shows a concession is about to be made. Keep a study sheet of transition words and divide them into categories: Examples, Adding, Contrasting, Emphasis, Resulting In, etc. It’s an ongoing process to familiarize yourself with these, but a worthwhile one.

Determine what is missing for Complete the Passage Questions. What does the blank represent? Often it will be either a restatement of the conclusion, or another supporting piece of evidence, but it could also be an action advocating by the author, or an example of the author’s argument applied to the real world.

Make a prediction (and write it down)! This is the most important strategy for CR. You’ve got to trust that you understand the argument enough to know what should be the correct answer. Don’t worry about making it perfect – just get something down on paper! If you think of your prediction but don’t write it down, you risk forgetting it or twisting it to fit the answer choices.

Eliminate out-of-scope answers. While the correct answer may not perfectly match your prediction, the simple fact that you took the time to think critically while you came up with a prediction will help you understand the author’s focus and the flow of his argument. Eliminate answer choices that would NOT follow the gist of the paragraph. Especially look for those that are outside the scope of the author’s focus, a favorite CR wrong answer type!

Try the Negation Technique. An assumption is something that needs to be true and is required in order for the Evidence to lead to the Conclusion. If we negate the answer choices then the correct choice will weaken the argument the most. This is an excellent strategy to try for Assumption questions.

Questions? Feel free to reach out at gmatrockstar[at]! I look forward to helping you on your GMAT journey!