II.

1. We have been visited by Nam many times.

2. That book has been read many times.

3. The window have been broken by the boy.

4. He has been stopped by the police.

5. Daisy has been seen recently.

6. They have been helped by them. 

III.

1. When we were young, we used to do many stupid things.

2. They used to lazy before.

3. Long used to like ice-cream before.

4. When we were at secondary school, we used to play so much.

5. I used to be a naughty student.

6. As a little boy, he used to cut classes.

IV.

1. How about going out tonight ?

2. Would you like to learn English with me ?

3. Would you like to go to the library ?

4. How about going to the Botanical Garden with us ?

5. How about joining us in the picnic ?

6. Would you like to take part in the contest next week ?

II.

1. We have been visited by Nam many times.

2. The book has been read by them many times.

3. The window has been broken by the boy.

4. He has stopped by the police.

5. Daisy has been seen by them recently.

6. They have been helped by us.

III.

1. When we were young, we used to do many stupid things.

2. They used to be lazy.

3. Long used to like ice-cream. 

4. When we were at secondary school, we used to play so much.

5. I used to be a naughty student.

6. As a little boy, he often used to cut class.

IV.

1. How about going out tonight ?

2. Would you like to learn English with me ?

3. Would you like to go to the library ?

4. How about going to the Botanical Garden with us ?

5. How about joining us in the picnic ?

6. Would you like to take part in the contest next week ?