Notes On More Rules - Subject Verb Concord - CBSE Class 10 English Grammar
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.

Summary

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.
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