1. It was kind of you to help me.

2.Robert is not only a playwright but but also an actor

3. haven’t seen Linda since Jimmy's birthday party

4.Mrs Ha had Alice carry those books back home 

5.The problem can be understanded by a child 

6.The box is so heavy that i cant lift it

7.It's the first time i have ever seen that play

8.My father's new car is being watched by them 

9.The living room is being painted at the moment

10. John's brother doesn't drive as carefully as he does

11.It is difficult to learn English

12.The questions were so difficult that we couldn't answer all of them

13.If I knew her phone number, I would call her

1. He suggested using fewer plastic bags

2.We haven’t seen our uncle for (the last) five months

3. I'll finish the work tonight if you like

4.I wish that our teacher was here at the moment

5.The date of the meeting will have to be changed again

6.In case you get hungry on the train, you should take some sandwiches

7.Everyone who visits the town falls in love with it

8. Although Mr. Anderson couldn't speak Vietnamese, he decided to settle in Hanoi

=>
1. It was kind of you to help me.
2. Robert ís not only a playwright but also an actor.
3. I haven't seen Linda since Jimmy's birthday party.
4. Mrs Green had Alice carry those books back home.
5. The problem can be understood by a child.
6. The box is so heavy that I can't lift it.
7. It's the first time I have seen that play.
8. My father's new car is being watched by them.
9. The living room is being painted at the moment.
10. John's brother doesn't drive as carefully as John.
11. It is not easy to learn English.
12. The questions were so difficult that we couldn't answer all of them.
13. If I knew her phone number, I could call her.

1. He suggested using fewer plastic bags.
2. We haven't seen our uncle for five months.
3. I'll finish the work tonight if you like.
4.  I wish our teacher were here at the moment.
5. The date of the meeting will have to be changed again.
6. In case you get hungry on the train, you should take some sandwiches.
7. Everyone who visits the town falls in love with it.
8. Although Mr.John didn't speak Vietnamese, he decided to settle in Ha Noi.