The subject of the sentence should agree with the verb in number and person.
1. When the subject of a sentence is composed of two or more nouns or pronouns connected by and, use a plural verb.
Example: Sarita and Malini are at the fair.
2. When two or more singular nouns or pronouns are connected by or or nor, use a singular verb.
Example:The paper or the file is in the drawer.
3. When a compound subject contains both a singular and a plural noun or pronoun joined by or or nor, the verb should agree with the part of the subject that is nearer the verb.
Example: Suresh or his friends run every day.
His friends or Suresh runs every day.