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Subjects and verbs have to agree with each other in number. It is not
acceptable to mix a plural subject with a singular verb or vice versa. Singular
subjects must be paired with singular verbs and plural subjects must be paired
with plural verb. It is important to be certain that you are selecting the
correct word in the sentence as the subject. Whenever you are dealing with
sentences that have prepositional phrases, eliminate the phrases before choosing
the subject. Sentences that have inverted word order or begin with here or there
often have the subject following the verb rather than in front of the verb. Once
again look carefully before selecting the subject to agree with the verb.

In addition to these problems, compound subjects, indefinite pronouns, and
collective nouns all present possible agreement problems. Compound subjects
joined with and are plural while subjects joined by or or nor have a verb that
agrees with the subject closest to the verb. Indefinite pronouns are always
singular and collective pronouns are usually singular. Collective nouns can be
plural when all the members of the collective unit are functioning as
individuals rather than as one unit