so sánh sự khác nhau giữa địa hình phía Tây ở Bắc Mĩ và phía tây ở Nam Mĩ. 

giúp mình với ạ.. Mình cảm ơn.

Exercise 1: Change the following sentences into passive voice in present simple

1.    Ngoc  takes her dog for a walk.

........................................................................................

2.    Everybody speaks English all over the world.

........................................................................................

3. The waiter brings me this dish.
………………………………………………………

4. They keep these rooms tidy all the time.

…………………………………………………

5. Our friends don’t send these postcards to us.

……………………………………………………

Exercise2: Change the following sentences into passive voice in past simple

6. He invited me to his birthday party last night.
………………………………………………………

7. The boss didn’t phone the secretary this morning.
…………………………………………………………

8. You showed them the special camera.

…………………………………………………………

9. My father watered this flower yesterday.

…………………………………………………………

10. Hoa did her homework last night.

…………………………………………………………

 gấp ạ, mình cảm ơn.