Английский,обращаюсь за помощью)Отыскать в каждом пункте одну грамматическую ошибку и исправить

Английский,обращаюсь за помощью)

Найти в каждом пт одну грамматическую ошибку и поправить её
1. When have they done it?
2. It is not his cat. It is our.
3. Do not bother me! I write a business letter.
4. She is writing a book. Book is dedicated to social inequality.
5. Who does know Spanish in your group?
6. When she had heard a cry she looked back.
7. I have three children boy and two girls.
8. The documents have already signed.
9. How are you? I am good, thanks.
10. Has he to get up early to come to work in time?
11. The book was written Pushkin.
12. I usually have coffee without a sugar.
13. Do you expect me do it without any help?
14. Woman appeared round the corner dressed in all black.
15. Where are belongings of Steve?
16. I live in big city.
17. Open window!
18. I have never passed through right wing of this building.
19. What are the administrative parts of UK?
20. When we arrived our children slept.
21. If I will meet her I will ask about it.
22. We thought it will be easier.
23. All the children like ice cream.
24. Do I must to rise at 4 a.m.?
25. I canned dance all night when I was young.