1.One girl didn't know anybody in the States.
2. Most people had never seen something like it.
3.Nobody did something wrong.
4.There isn't someone in the computer room.
5. Dave never swims in the sea.
6. I haven't been somewhere last week .
7.It's important to don't panic.
8. Have you done your homework?
Sper ca te-am ajutat! :).