There is a mistake in each of these senteces. Underline the mistake and then correct it

There is a mistake in each of these senteces. Underline the mistake and then correct it
1. It has started raining an hour ago
2. I knew Hoa for some months
3. We didn't see Nga since Monday
4. Lan was in the USA for 2 years
5. l have gone to bed at 10 o'clock last night
6. They moved to London for 2003
7. How long have you learn English?
8. Peter was ill for a week
9. Some of the stores in Tran Phu street may have to close
10. ls there a restaurant close in?