1.students are doing a lot of work
-A lot of work are being done by students
2.i last saw my uncle when i was a school boy
-I haven't seen my uncle since i was a school boy
3.peter spent three hours repainting his house
- It took peter three hours to repaint his house
4.his wardrobe was so heavy that we couldn't move it
-It was such a heavy wardrobe that we couldn't move it
5.they spend haif an hour watching the news on tv everyday
-It takes them half an hour to watch the news on tv everyday
6.i am sorry to have kept you waiting
-I must apologize for having kept you waiting
7.it is more dangerous to ride a motobike than to drive a car -riding
it is safer to drive a car -riding than to ride a motobike
8.he stood on a chair in orther to reach the top shelf
-He stood on a chair so that he could reach the top shelf
9.talking part in the beauty contest is no interest to her at all
- She is not keen on taking part in the beauty contest
11.she's not in the habit of living on her own
-She's not used to living on her own
12.the bridge was so low that the lorry couldn't go under it
-It was such a low bridge that the lorry couldn't go under
13.mr. Phan drives more carefully than he used to
-Mr phan doesn't drive as carelessly as he used to
14.a spaceship from another planet took them away
-They were taken away by a spaceship from another planet
15.driving on the left feels strange to him
-He isn't used to driving on the left
16.she took no notice of what i was doing for her
-She didn't pay attention to what i was doing for her
17.she worked Hard because She wanted everything would be ready by 6'clock
- She worked hard so that everything would be ready by 6'clock
18.i feel strange when i live in a big city
-I'm not used to living in a big city
19.the house was so expensive that i couldn't buy ít
-The house was too expensive for me to buy
20.people believe that heroin is very danger for our health
-Heroin is believed to be very danger for our health
21.nam sorry now that he didn't accept the job
-Nam now wishes that he had accepted the job