Say it in a different way 1)i don't know anybody here. 2)i don't think anybody can help us. 3)i can't see anything behind the window. 4)we don't understand anything. 5)they couldn't buy anything in the supermarket. 6)we haven't got any money. 7)don't ask anybody to help you. 8)he doesn't like anything on the menu.
2) I think nobody can help us.
3) I can see nothing behind the window.
4) We understand nothing.
5) They could buy nothing in the supermarket.
6) We have got no money.
7) Ask nobody to help you.
8) He likes nothing on the menu.