infinitive pronouns
1.   We use indefinite pronouns when we want to talk about the people or things without saying exactly who or what they are.
some-                          any-               no-                 every-
someone                     anyone            no one             everyone
somebody                   anybody          nobody           everybody
something                   anything          nothing           everything
2.   When indefinite pronouns are subjects, they take singular verbs.
Everything is... .
Somebody tells....
Something is... .
3.   Someone and somebody, nobody and no one, everybody and everyone, anybody and anyone are the same.
4.   We use someone (somebody) and something in positive sentences. We can use it in questions but the answer must be positive.
***   We met someone (somebody) at the meeting yesterday.
***   Is there someone at school ?
5.   We use anyone (anybody) and anything in negative sentences.
***   There isn 't anything in the basket.
6.   We use no one (nobody) and nothing in positive sentences. But the meaning of the sentence is negative.
***   Today is Sunday. There is no one (nobody) at school. (There isn't any one (anybody) at school.)
7.   We use everyone (everybody) and everything in positive sentences.
***   The thief stole everything in the house.
***   Everyone in the room watches the film.
8.   Somewhere = (in) an indefinite place.              9.   Everywhere = (in) all (the) places.
***   We may go somewhere tonight.                       ***   We looked everywhere to find them.
10. Nowhere = in (no) places.                                11. Anywhere = in or to any place.
***   I can't study here, there's nowhere to study. ***   We didn 't go on holiday anywhere this year.
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