1. Minh brushes his teeth (twice a day.)
->How often does Minh brush his teeth?
2. Simon is in a lot of pain now (because he has a toothache.)
->Why is Simon in a lot of pain now?
3. I felt (sick) after eating that food.
->How did you feel after eating that food?
4. Nga went to see the dentist (last week.)
->When did Nga go to see the dentist?
5. (Dr Lai) will check your teeth.
->Who will check your teeth?
6. It took Dr Phong (10 minutes) to fill Van’s tooth.
->How long did it take Dr Phong to fill Van's tooth?
7. My brother is going to (the hospital.)
->Where is your brother going to?
8. Mr. Cuong (did morning exercises) at 5.30 yesterday.
->What did Mr Cuong do at 5.30 yesterday?
9.Hoa received (her aunt’s) letter five days ago.
->Whose letter did Hoa receive five days ago?
10. There are (twelve) students in Lien’s class having toothache.
->How many students are there in Lien's class having toothache?