An indefinite pronoun is a pronoun that does not refer to a specific person, place, thing or idea. Some common indefinite pronouns are formed from the prefixes some-, any-, no- and every- combined with compound nouns referring to people, things, or places. These indefinite pronouns are used in affirmative and negative sentences depending on the prefix used.

1. An indefinite pronoun is a pronoun that does not
refer to a specific person, place, thing or idea
Some indefinite pronouns are compound nouns
of some-, any-, no- and every-

2. People Things
Places
 some- someone /somebody something somewhere
 any- anyone /anybody anything anywhere
 no- no one /nobody nothing nowhere
 every- everyone /everybody everything everywhere

3. SOME- Affirmative sentences and questions (when
they are requests or offers)
e.g. Someone was sitting on the sofa
ANY- Negative (with a negative verb) and interrogative
sentences
e.g. The police couldn’t find her anywhere?/Is there
anything to eat?
NO- Affirmative sentences with a negative meaning
e.g. Nobody was at home when I called/There’s nothing
we can do.
EVERY- Affirmative sentences and questions
e.g. Her mother looked for her everywhere?/Is everything
all right?

4. There is someone / anyone in my house.
someone
There is anything / nothing in the fridge.
nothing
Can I tell you something / nothing?
something
He gave me anything /everything I asked for.
everything
No one / Anyone came to visit her.
no one
Anybody / Somebody called me yesterday.
somebody
Did you go anywhere / nowhere last weekend?
anywhere
I have looked somewhere / everywhere for my pen.
everywhere