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Sentence Correction: Subject Verb Agreement Questions - Overview

Because the theater production in which John participated has failed, he now dismiss all thoughts of acting again.

Incorrect.

This answer choice is grammatically incorrect. The singular subject he does not agree with the plural verb dismiss.

Well done!

This answer choice corrects the Subject Verb Agreement mistake in the original sentence, by changing the plural verb dismiss with the singular verb dismisses.

Although this answer choice adds the words his ever, and is therefore more redundant than the original sentence, it is the only grammatically correct answer choice.

And yes, placing his before an 'ing' word is correct as the V + ing here acts as a noun. Just as it is ok to say His house is expensive, it is equally ok to say: His acting on Broadway contributed to his successes in Hollywood. Acting is simply a noun as is successes so a possessive adjective can precede these.

Remember, a correct answer choice may contain a redundancy, if there are no other answer choices which are both grammatically correct and stylistically correct

Incorrect.

This answer choice repeats the original Subject Verb Agreement mistake.  The singular subject he does not agree with the plural verb dismiss.

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake, by changing the plural verb dismiss with the singular verb dismisses, it creates a new one. The singular subject theater production does not agree with the plural verb have.

This answer choice repeats the original Subject Verb Agreement mistake. The singular subject he does not agree with the plural verb dismiss.

has failed, he now dismiss all thoughts of
has failed, he now dismisses all thoughts of his ever
has failed, he now dismiss all thoughts about
have failed, he now dismisses all thoughts of
is failing, he now dismiss all thoughts of