What are the rules for subject-verb agreement?

The rules for subject-verb agreement are as follows:

1. Singular subjects take singular verbs, while plural subjects take plural verbs.
Example: The cat jumps. (singular subject and verb)
The cats jump. (plural subject and verb)

2. When the subject is a singular noun or pronoun, the verb must also be singular.
Example: She sings beautifully. (singular subject and verb)

3. When the subject is a plural noun or pronoun, the verb must also be plural.
Example: They play soccer every weekend. (plural subject and verb)

4. Indefinite pronouns, such as everyone, somebody, or each, are considered singular and require singular verbs.
Example: Everyone is invited to the party. (singular subject and verb)

5. Collective nouns, such as team, family, or committee, can be singular or plural depending on the context. If the members of the group are acting as individuals, use a plural verb. If the group is acting as a single unit, use a singular verb.
Example: The team is practicing. (singular subject and verb)
The team are arguing among themselves. (plural subject and verb)

6. In sentences with compound subjects joined by "and," use a plural verb.
Example: John and Mary are going to the movies. (plural subject and verb)

7. In sentences with compound subjects joined by "or" or "nor," the verb agrees with the subject closest to it.
Example: Neither the cat nor the dog is allowed on the couch. (singular subject and verb)

8. In sentences with phrases or clauses between the subject and verb, the verb agrees with the subject, not the words in between.
Example: The book, along with the pen and notebook, is on the table. (singular subject and verb)