1. something, anything, nothing, etc.

2. somebody Somebody (or someone) has broken the window.
somebody / someone = a person but we don’t know who

3. something She has something in her mouth.
something = a thing but we don’t know what

4. somewhere Tom lives somewhere near London.
somewhere = in/to a place but we don’t know where

5. People (+) verb (-) verb Quick! Somebody’s coming.
I didn’t know anyone at that party.
(-) verb
Where’s Tom? Has anybody seen him?
(?) questions
‘Who did you meet?’ ‘Nobody’
short answers
Nobody came to class yesterday.

6. Things Ann said something. I didn’t buy anything.
(+) verb
I didn’t buy anything.
(-) verb
Did you have anything to drink?
(?) questions
‘What’s in the bag?’ ‘Nothing.’
short answers
There’s nothing in the bag. or Nothing happened.

7. Places They live somewhere in England. (+) verb
Did you go anywhere interesting last Christmas?
(-) verb
I’m not going anywhere next summer.
(?) questions
‘Where did you go yesterday?’ ‘Nowhere.’
short answers
I don’t like this town. There’s nowhere to go.