помогите пожалуйста с английским

1. Could you please close the door? I don't hear anything.
2. Can you see that girl over there?
3. Could you get tickets yesterday?
4. I can't understand what you said.
5. I looked up, but I couldn't see anything.
6. We can smell something burning.
7. I could hear a noise outside the door.
8. He couldn't do it all by himself. He was practically unprepared.
9. She couldn't do it last week. She had no time.
10. I couldn't buy that book yesterday.