Chuyển các câu sau sang bị động:
1. Don't speak until someone asks you.
2. Doctors advise us to exercise.
3. The terrorists made us lie down.
4. Someone saw him go into a shop.
5. Someone saw her looking into a shop.
6. No one helps me solve this problem.
7. They kept him waiting for half an hour.
Chuyển các câu sau sang bị động:
1. Don't speak until someone asks you.
don't speak until you are asked
2. Doctors advise us to exercise.
we are advised to exercise by doctors
3. The terrorists made us lie down.
we are made to lie down by the terrorists
4. Someone saw him go into a shop.
he was seen to go into a shop
5. Someone saw her looking into a shop.
she was seen looking into a shop
6. No one helps me solve this problem.
i am not helped to solve this problem
7. They kept him waiting for half an hour.
he was kept waiting for hald an hour