We use a singular verb after an indefinite pronoun:
Everybody loves Sally.
Everything was ready for the party.
When we refer back to an indefinite pronoun we normally use a plural pronoun:
Everybody enjoyed the concert. They stood up and clapped.
I will tell somebody that dinner is ready. They have been waiting a long time.
We can add -'s to an indefinite pronoun to make a possessive.
They were staying in somebody’s house.
Is this anybody’s coat?
We use indefinite pronouns with no- as the subject in negative clauses (not pronouns with any.)
Anybody didn’t come >> Nobody came.
We do not use another negative in a clause with nobody, no one or nothing: