1. chuyển các câu sau đây sang phủ định , nghi vấn
1. I used to be a tourist guide when I lived in America
2. she used to take care of my children
3. they are used to working under high pressne
4. I am used to drinking coffee at night
5. his father used to work very hard
6. she is used to reading magazines written in english
7. they are used to new working hours
8. he used to refuse to give me a chance
9. he used to teach us english when we studen't at the university
10. I used to attend his speech