The indefinite pronouns are:

somebody    someone    something   
anybody    anyone    anything   
nobody    no one    nothing   
everybody    everyone    everything   

We use indefinite pronouns to refer to people or things without saying exactly who or what they are. We use pronouns ending in -body or -one for people, and pronouns ending in -thing for things:

Everybody enjoyed the concert.
I opened the door but there was no one at home.
It was a very clear day. We could see everything.

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:

Nobody came.
Nothing happened.

We use else after indefinite pronouns to refer to people or things in addition to the ones we already mentioned.

All the family came, but no one else.
If Michael can’t come we’ll ask somebody else.
So that's eggs, peas and chips. Do you want anything else?

Exercise