Subject-Verb Agreement Error Correction

Find the real subject first, then check whether the verb matches that subject. Do not start by looking at the noun closest to the verb, because that noun may be inside a phrase such as "of the books" or "with the children." In "The cover of the books is damaged," the subject is "cover," so the singular verb "is" is correct. After you find the subject, check common traps: third-person singular -s, there is/are, do/does in questions, and either...or or neither...nor.

Phrases between the subject and verb often contain a noun with a different number from the true subject. That nearby noun can pull the wrong verb form into the sentence. For example, in "The quality of the reports is high," the plural noun "reports" is closer to the verb, but the subject is "quality." A reliable correction strategy is to remove the phrase mentally: "The quality is high." If the shorter sentence works, you have found the subject that controls the verb.

Check four things. First, third-person singular subjects usually need a present-simple verb ending in -s or -es. Second, plural subjects use the base verb. Third, words such as everyone, nobody, each, and the number of are singular even when they refer to a group. Fourth, special structures have their own patterns: there is/are agrees with the following noun, and either...or or neither...nor usually agrees with the nearest subject. If the sentence is already correct, leave it unchanged.