Sample Sentence Correction Questions

Written by Kelly Granson. Posted in GMAT Sample Questions

Question 1.

By converting iron atoms into iron oxide molecules, the metal surface is corroded by oxygen and water, causing metal objects to fail prematurely.

(A) the metal surface is corroded by oxygen and water, causing metal objects to fail

(B) the metal surface is corroded by oxygen and water, and this causes metal objects to fail

(C) oxygen and water corrode the metal surface, which causes metal objects to fail

(D) oxygen and water corrode the metal surface, causing metal objects to fail

(E) oxygen and water corrode the metal surface, and this causes metal objects to fail

Explanation:

The modifying phrase must be close to what it modifies. Here, the phrase 'By converting iron atoms into iron oxide molecules' is the modifier, and should be immediately followed by 'oxygen and water,' which convert iron atoms into iron oxide molecules and not by 'the metal surface' which is being corroded.

The modifying phrase must be close to what it modifies. Here, the phrase 'By converting iron atoms into iron oxide molecules' is the modifier, and should be immediately followed by 'oxygen and water,' which convert iron atoms into iron oxide molecules and not by 'the metal surface' which is being corroded.

(A) The metal surface is not what is being described by 'By converting iron atoms into iron oxide molecules.' The modifier should be followed by 'oxygen and water' as they are what converts iron atoms into iron oxide molecules and not the metal surface. Also, the sentence is in passive voice, whereas active voice should be used whenever possible.

(B) Same modification error as above. In addition, pronoun 'this' does not refer to any noun.

(C) This choice corrects the initial modification error; however, 'which causes' erroneously implies that the metal surface causes metal objects to fail.

(D) Correct.

(E) Pronoun 'this' does not refer to any noun. The correct construction would be 'oxygen and water corrode the metal surface, causing metal objects to fail'.

The correct answer is D.

Question 2.

For car owners who keep their vehicles well maintained, tuning at regular intervals, and servicing every 1,000 miles, automobiles are delivering trouble-free performance for years.

(A) tuning at regular intervals, and servicing every 1,000 miles, automobiles are delivering

(B) tuned at regular intervals, and serviced every 1,000 miles, the automobile will deliver

(C) tuned at regular intervals, and serviced every 1,000 miles, automobiles will deliver

(D) tuned at regular intervals, and servicing every 1,000 miles, automobiles are delivering

(E) tuning at regular intervals, and serviced every 1,000 miles, the automobile deliver

Explanation:

To maintain parallelism with the noun "their vehicles," pick an answer that makes "automobiles" plural as well (eliminate B and E). Choices A and D offer the present progressive verb "are delivering," but this does not align with the simple present verb "keep" in the non-underlined portion.

(A) The intention of the sentence is to provide a list of things that car owners can do to keep their cars running well. Owners should keep their cars (1) well maintained, (2) tuned, and (3) serviced. "Tuning" and "servicing" are present participles that do not match the non-underlined past participle "well maintained." "Are delivering" is in the wrong tense.

(B) "The automobile" does not logically agree in number with "their vehicles."

(C) Correct. The future-tense verb "will deliver" corresponds to the description "for years."

(D) Like choice A, this option does not present a list of items in parallel construction. "Well maintained" and "tuned" do not align with "servicing." "Are delivering" is in the wrong tense.

(E) Same number error as in choice B.

The correct answer is C.


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