1. How often does he brush his teeth
2. Why is Simon in a lot of pain now
3. How do you feel after eating that food
4. When did Nga went to the dentist
5 Who will check my teeth
6 how long did it took Dr Phong to fill Vân 's teeth
7 Where is your brother going
8 what did Mr Cuong did at 5:30 yesterday
9Who did Hoa received letter 5days ago
10 how many students in Liên's class having a toothache yesterday
( nếu thấy hay thì vote giúp mk 5 sao một cảm ơn và câu TL hay nhất nhé, thanks bn rất nhiều )^^