Subject-Verb Agreement

Definition:Verbs must agree with their subjects according to number (singular and plural) and to person (first, second, or third).  There are a few tricky situations for which the following rules will help:
1.  Be careful that the words (usually prepositional phrases) that separate the subject from the verb DO NOT determine the verb.
Example: The samples on the tray in the lab need (not needs) testing.

2.  Subjects that are joined by and usually take plural verbs.
Example: Sarah and Bill sing every Friday at the opera house.

3.  Subjects joined by neither . . . nor, either . . . or, or simply or have verbs that agree with part of the subject closest to the verb.
Example: Neither the coach nor his playerswere (the subject players determines this verb) satisfied with their performance.
Example: A driver's license or two credit cardsare required.

4.  Indefinite pronouns (anybody, everyone, each, anyone, someone) that act as subjects usually take singular verbs.
Example: Each of the puppies has been taken to a good home.
Example: Everyone who elected the course was being tutored.

5.  Collective nouns (jury, committee, team, audience, crowd) that act as subjects usually take singular verbs.
Example: The search committee was deadlocked over choosing the right person for the job.

6.  A verb must agree with its subject even if the verb comes after the subject of the sentence.
Example: There are three trees resting against the fence.
Example: Under the mighty oak tree sits our dog.

Web Link for Subject-Verb Agreement