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Sentence Correction: Subject Verb Agreement - A Plural Subject Consisting of Singular Nouns that are Connected by 'and'

The average consumer and the small-scale retailer has no way of knowing whether the products they buy or sell are destructive to the ecology.

This answer choice is grammatically incorrect and creates a Subject Verb Agreement error. The plural subject The average consumer and the small-scale retailer does not agree with the singular verb has.

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

A plural subject made up of singular nouns connected by and

Although this answer choice corrects the original Subject Verb Agreement error by matching the plural subject The average consumer and the small-scale retailer with the plural verb have, in the GMAT, the addition of the phrase or not at any point after the word whether is considered redundant.

Although this answer choice corrects the original Subject Verb Agreement error by matching the plural subject The average consumer and the small-scale retailer with the plural verb have, in the GMAT, the addition of the phrase or not at any point after the word whether is considered redundant.

Although this answer choice corrects the original Subject Verb Agreement error by matching the plural subject The average consumer and the small-scale retailer with the plural verb have, in the GMAT, If should be used in Conditionals only. If you see if in a sentence and there's no condition, you should replace if with whether.

Think of whether as a choice between two possibilities dealing with the same subject or as a yes/no question.

Example: I do not know whether this will work. (yes or no)

He was not sure whether he wanted banana or chocolate cake. (a choice between 2 possibilities)

Very well done!

This answer choice corrects the original Subject Verb Agreement error by matching the plural subject The average consumer and the small-scale retailer with the plural verb have. It also follows the rule that, in the GMAT, the addition of the phrase or not at any point after the word whether is considered redundant.

has no way of knowing whether the products they buy or sell are destructive to the ecology
have no way of knowing whether the products they buy or sell are destructive to the ecology or not
have no way of knowing if the products they buy or sell can cause destruction to the ecology
have no way of knowing whether or not the products they buy or sell are destructive to the ecology
have no way of knowing whether the products they buy or sell cause destruction to the ecology