A. somebody (or someone) / something / somewhere
Somebody (or someone) has broken the window = a person but we don't know who
They live somewhere near London = in/to a place but we don't know where
• She has got something in her mouth.
• Something = a thing but we don't know what
B. people (-body or -one)
somebody or someone
anybody or anyone
nobody or no-one
-body and -one are the same: somebody = someone, nobody = no-one etc.
• There is somebody (or someone) in the garden.
• There is anybody (or anyone) in the garden?
• There is nobody (or no-one) in the garden.
C. things (-thing)
• She said something but I didn't understand her.
• Are you doing anything at the weekend?
• I was angry but I didn't say anything.
• 'What did you say?' 'Nothing.'
D. places (-where)
• They live somewhere in the south of England.
• Did you go anywhere interesting for your holidays?
• I'm staying here. I'm not going anywhere.
• I don't like this town. There is nowhere to go.
E. something/anybody etc. + adjective (big/cheap/interesting etc.)
• Did you meet anybody interesting at the party?
• We always go to the same place. Let's go somewhere different.
• 'What's that letter?' 'It's nothing important.'
F. something/anybody etc. + to ...
• I'm hungry. I want something to eat. (= something that I can eat)
• He hasn't got anybody to talk to. (= anybody that he can talk to)
• There is nowhere to go in this town. (= nowhere where people can go)
somebody / anybody / nobody
somebody in the garden
anybody in the garden?
nobody in the garden
something / anything / nothing
said something
doing anything
say anything
somewhere / anywhere / nowhere
live somewhere
go anywhere
nowhere to go