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Sentence Correction: Subject Verb Agreement - A Complex Subject/Long Distance between Subject and Verb

Only a few drivers, according to a survey conducted recently, frequent check their mirrors for oncoming traffic.

Incorrect.

This answer choice is grammatically incorrect. An adjective (frequent) cannot describe a verb (check). Adjectives can only describe nouns.

Example:

Drivers should perform frequent checks.

An adverb should be used to describe a verb:

Drivers should check frequently.

Incorrect.

This answer choice is grammatically incorrect and repeats the original Parts of Speech error. An adjective (frequent) cannot describe a verb (check). Adjectives can only describe nouns.

Example:

Drivers should perform frequent checks.

An adverb should be used to describe a verb:

Drivers should check frequently.

Incorrect.

This answer choice is grammatically incorrect and repeats the original Parts of Speech error. A noun (frequency) cannot describe a verb (check). 

An adverb should be used to describe a verb:

Drivers should frequently check their mirrors.

Incorrect.

Although this answer choice corrects the original Parts of Speech error by using an adverb to describe a verb, it creates a Subject Verb Agreement error. The plural subject drivers does not agree with the singular verb checks.

What helps us identify this question as a Subject Verb Agreement question and identify the mistake is the following Stop Sign:

A long complex subject / a long distance between the subject and the verb

Well done!

This answer choice corrects the original Parts of Speech error by using an adverb (frequently) to describe a verb (check).

Only a few drivers, according to a survey conducted recently, frequent check their mirrors for oncoming traffic
According to a survey conducted recently, only a few drivers check their mirrors for oncoming traffic frequent
Only a few drivers, according to a survey conducted recently, frequently checks their mirrors for oncoming traffic
According to a recent survey, only a few drivers frequently check their mirrors for oncoming traffic
According to a recent survey, only a few drivers frequency check their mirrors for oncoming traffic