A Verb must agree with its Subject in Number and Person. A singular subject takes a singular verb; and a plural subject takes a plural verb.

Rules for Agreement of subject and verb:

1) Two or more singular subjects joined by ‘and’ usually take a plural verb.

E.g. – Raman and Harry work hard.

Air and water are necessary for survival.

Nancy and I were the hosts of the party.

The author and the publisher were in a meeting.

2) If two nouns suggest only one idea or refer to the same person or thing then it will take a singular verb.

E.g. Slow and steady wins the race.

Beans and rice is her favourite dish.

The horse and carriage is at the door.

Comfort and luxury has made him lazy.

Bread and butter is a wholesome breakfast.