1. It's no use asking them keep quiet.

keep -> to keep

cấu trúc: ask sb to V

2. This text is too long for me to read it.

bỏ it vì nó trùng với chủ ngữ của câu

3. I can't get used to doing so difficult exercises.

So => such.

g/t: Từ so đứng trước bổ nghĩa tính từ đứng riêng, còn từ such đứng trước bổ nghĩa cho danh từ

4. My father doesn't know speak English.

speak -> how to speak know 

cấu trúc:( how/what/where/...) + to V (or clause)

5. She behaves as if she was a baby.

was -> were

g/t: câu giả định không bao giờ dùng was,luôn dùng were

6. You wanted me to tellyou about what I was doinghere and how was my life.

g/t:-was chuyển ra đằng sau my life 

      -đây là câu tường thuật nên không đảo was lên trước chủ ngữ

7. The course is good, but more hard than I thought.

more hard -> harder

 g/t: hard là 1 tính từ ngắn nên trong câu so sánh hơn sẽ thêm đuôi er

8. Sleeping all day, to eat too much and never going out is unhealthy.

to eat -> eating

g/t: eat chia giống "sleeping, going " khi cả 3 cùng lm chủ ngữ

9. The dentist gave me a check upand then

-> câu 9 bị thiếu nha bạn!

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chúc bạn học tốt!

:)