1 I couldn't find the railway station, so I stopped somebody anybody to ask directions.
2 There was anything / nothing in the fridge, so
we had to go to a restaurant to eat.
3 I knew there was nothing / something I had to
do, but I couldn't remember what it was!
4 I didn't go out somewhere / anywhere on
Saturday because I didn't have any money.
5 Anybody / Somebody phoned me in town, but
the signal was bad and I don't know who it was.
6 I'm sure I heard a knock on the door, but there
was anybody / nobody there.