Chuyển các câu sau sang phủ định và nghi vấn:
1. he is keen on playing tennis.
2. we insist on cooking the dinner ourselves.
3. she kept to walk during the film.
4. we can't help laughing when we see a comedy.
5. I've finished cooking come and eat.
6. my uncle is afraid of going by train.
7. you should give up smoking.
8. Sam dreams of being a pop star.
9. I am learning speaking English.
10. She practices to play the guiter.