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Sentence Correction: Subject Verb Agreement - Verb Precedes Subject

The following underlined portion of the sentence contains a Subject Verb Agreement error. What is that error?

Those is dangerous dogs.

That's exactly right.

The correct answer choice is that the verb is should be changed to are so that it agrees with the subject dogs.

Although the verb is must to be changed to agree with the subject, Those is not the subject of the sentence.

The word Those correctly refers to the word dogs, as both words are plural. Notice that since dogs isn't underlined, and therefore cannot be changed, Those should also remain as it is. In this case, the problem is with the verb is.

Normally, on the GMAT, the subject is what comes BEFORE the verb, but sometimes the subject comes after the verb as in this case in which the subject is dogs, not Those.

Since dogs is plural, it must agree with its verb, therefore the verb is must be changed to its plural form, are.

When testing for Subject Verb Agreement, we must look at the verb and ask what the subject of the verb is, i.e., what or who performs that action, and be aware that the subject can come after the verb.

The verb is should be changed to are so that it agrees with the subject dogs.

The verb is should be changed to are so that it agrees with the subject Those.

The word those should be changed to this so that it agrees with the verb is.

I don't know