1. I caught him climbing over my wall. I asked him to explain himself but he refused to say anything, so in the end I had to let him go.
2. When at last I succeeded in convincing him that I wanted to get home quickly, he put his foot on the accelerator and I felt the car leap forward.
3. I’m not used to driving on the left.
4. When you see everyone else doing it, you’ll find it quite easy to do yourself.
5. It is pleasant to sit by the fire at night and to hear the wind howling outside.
6. There was no way of getting out of the building except by climbing down a rope and Ann was too terrified to do this.
7. We heard the engines roaring as the plane began to move and we saw the people on the ground waving goodbye.
8. It’s no good writing to him; he never answers letters. The only thing is to go and see him.
9. Why did you go all round the field instead of walking across it?
10. I didn’t like to cross it because of the bull. I never see a bull without thinking that it wants to chase me.
11. The people in the flat below seem to be having a party. You can hear the champagne corks (though) popping.
12. I don’t like to get bills but when I do get them I like to pay them promptly.
13. Ask him to come in. Don’t keep him standing at the door.
14. The boys next door used to make model aero planes, but they seem to have given up flying.
15. I knew I wasn’t the first to arrive, for I saw smoke rising from the chimney.
16. We watched the men sawing the tree and as we were walking away heard it fall with a tremendous crash.
17. I hate to see a child cry.
18. We watched the children jump from a window and fall into a blanket held by the people below.
19. It is very unpleasant to wake up and hear the rain beating on the windows.
20. She saw the lorry begin to roll forwards but he was too far away to do anything about it.
21. There are people who can’t help laughing when they see someone slip on a banana skin.
22. I prefer driving to being driven.

1. I caught him (climb) over my wall. I asked him (explain) but he refused (say) anything, so in the end I had (let) him (go)
 * climb: climbing (V-ing: làm tân ngữ cho động từ "caught")
 * explain: to explain (to V: sau động từ "asked")
 * say: to say (refuse + to V: từ chối làm gì)
 * let: to let (let + O + V: để ai đó làm gì)
 * go: go (let + O + V: để ai đó làm gì)
Đáp án: I caught him climbing over my wall. I asked him to explain but he refused to say anything, so in the end I had to let him go.
2. When at last I succeeded in (convince) him that I wanted (get) home quickly he put his foot on the accelerator and I felt the car (leap) forward.
 * convince: convincing (succeed in + V-ing: thành công trong việc làm gì)
 * get: to get (want + to V: muốn làm gì)
 * leap: leap (feel + O + V: cảm thấy cái gì đó làm gì)
Đáp án: When at last I succeeded in convincing him that I wanted to get home quickly he put his foot on the accelerator and I felt the car leap forward.
3. I'm not used to (drive) on the left. When you see everyone else (do) it you'll find it quite easy (do) yourself.
 * drive: driving (be used to + V-ing: quen với việc làm gì)
 * do: doing (see + O + V-ing: nhìn thấy ai đó đang làm gì)
 * do: to do (find it + adj + to V: thấy điều gì đó như thế nào khi làm gì)
Đáp án: I'm not used to driving on the left. When you see everyone else doing it you'll find it quite easy to do yourself.
4. It is pleasant (sit) by the fire at night and (hear) the wind (howl) outside.
 * sit: to sit (it is + adj + to V: thật là như thế nào khi làm gì)
 * hear: hearing (and + V-ing: và làm gì)
 * howl: howling (V-ing: làm tân ngữ cho động từ "hear")
Đáp án: It is pleasant to sit by the fire at night and hear the wind howling outside.
5. There was no way of (get) out of the building except by (climb) down a rope and Ann was too terrified (do) this.
 * get: getting (way of + V-ing: cách để làm gì)
 * climb: climbing
 * do: to do (too + adj + to V: quá... để làm gì)
Đáp án: There was no way of getting out of the building except by climbing down a rope and Ann was too terrified to do this.
6. We heard the engines (roar) as the plane began (move) and we saw the people on the ground (wave) good-bye.
 * roar: roaring (hear + O + V-ing: nghe thấy cái gì đó đang làm gì)
 * move: to move (begin + to V: bắt đầu làm gì)
 * wave: waving (see + O + V-ing: nhìn thấy ai đó đang làm gì)
Đáp án: We heard the engines roaring as the plane began to move and we saw the people on the ground waving good-bye.
7. It's no good (write) to him; he never answers letters. The only thing (do) is (go) and (see) him.
 * write: writing (it's no good + V-ing: thật vô ích khi làm gì)
 * do: to do
 * go: going
 * see: seeing
Đáp án: It's no good writing to him; he never answers letters. The only thing to do is to go and see him.
8. Why did you go all round the field instead of (walk) across it? I didn't like (cross) it because of the bull. I never see a bull without (think) that it wants (chase) me.
 * walk: walking
 * cross: crossing
 * think: thinking
 * chase: to chase
Đáp án: Why did you go all round the field instead of walking across it? I didn't like crossing it because of the bull. I never see a bull without thinking that it wants to chase me.
9. The people in the flat below seem (be) having a party. You can hear the champagne corks (thud) against their ceiling.
 * be: to be
 * thud: thudding (hear + O + V-ing: nghe thấy cái gì đó đang làm gì)
Đáp án: The people in the flat below seem to be having a party. You can hear the champagne corks thudding against their ceiling.
10. I don't like (get) bills but when I do get them I like (pay) them promptly.
 * get: getting
 * pay: paying
Đáp án: I don't like getting bills but when I do get them I like paying them promptly.

11. The boys next door used (like) (make) and (fly) model aero planes, but they seem to have stopped (do) that now.
 * like: to like (used to + V: đã từng làm gì)
 * make: making
 * fly: flying
 * do: doing
Đáp án: The boys next door used to like making and flying model aero planes, but they seem to have stopped doing that now.
12. I knew I wasn't the first (arrive) for I saw smoke (rise) from the chimney.
 * arrive: to arrive
 * rise: rising (see + O + V-ing: nhìn thấy ai đó đang làm gì)
Đáp án: I knew I wasn't the first to arrive for I saw smoke rising from the chimney.
13. We watched the men (saw) the tree and as we were walking away heard it (fall) with a tremendous crash.
 * saw: saw (watched + O + V: nhìn thấy ai đó làm gì)
 * fall: fall (heard + O + V: nghe thấy cái gì đó làm gì)
Đáp án: We watched the men saw the tree and as we were walking away heard it fall with a tremendous crash.
14. I hate (see) a child (cry).
 * see: seeing
 * cry: crying
Đáp án: I hate seeing a child crying.
15. We watched the children (jump) from a window and (fall) into a blanket held by the people below.
 * jump: jumping
 * fall: falling
Đáp án: We watched the children jumping from a window and falling into a blanket held by the people below.
16. It is very unpleasant (wake) up and (hear) the rain (beat) on the windows.
 * wake: to wake
 * hear: hearing
 * beat: beating
Đáp án: It is very unpleasant to wake up and hear the rain beating on the windows.
17. He saw the lorry (begin) (roll) forwards but he was too far away (do) anything (stop) it.
 * begin: to begin
 * roll: rolling
 * do: to do
 * stop: to stop
Đáp án: He saw the lorry begin to roll forwards but he was too far away to do anything to stop it.
18. There are people who can't help (laugh) when they see someone (slip) on a banana skin.
 * laugh: laughing
 * slip: slipping
Đáp án: There are people who can't help laughing when they see someone slipping on a banana skin.
19. I prefer (drive) to (be driven).
 * drive: driving
 * be driven: being driven
Đáp án: I prefer driving to being driven.
Giải thích chung:
 * V-ing: thường dùng để diễn tả một hành động đang diễn ra, hoặc một hành động được coi như là một danh từ.
 * To V: thường dùng để diễn tả mục đích, kết quả, hay một hành động cần được thực hiện.
 * Bare infinitive: động từ nguyên mẫu không "to" thường đi sau một số động từ modal (can, could, may, might, shall, should, will, would, must), hoặc sau các động từ khiến (make, let, have).