1) David and I wanted go off to find help but Bill insisted on staying near the car. (wanted 后加to，因为want 后要接不定式)
(2) …rather than go into the forest and getting lost. (getting 改get，因为get 与其前的go 并列)
(3) David pointed to a path which he thought would probably leading to a village. (leading 改为lead，因为其前有助动词would)
(4) I went back to get David and helped him to stood up. (stood 改为stand，因为to stand up 在此为不定式结构)
(5) Charles and Linda Mason do all of these things as well as climbed building. (climbed 改为climb / climbing，若将as well as 视为连词，则将climbed 改为climb，因为它与其前的do 并列；若将as well as 视为介词，则climbing，因为介词后动词用动名词)
(6) Modern people know more about health, have better food, and to live in clearer surroundings. (去掉live 前的to，因为live 与其前的know, have 并列)
(7) The World Health Organization and other organizations are working improve health all over the world. (improve前加to，to improve…为表目的的不定式短语)
(8) …you pay the cost of send a postcard, the librarian will write to you. (send改为sending，因为介词后接动名词作宾语)
(9) …and let you to know when the book you want has returned (去掉know 前的to，因为其前有动词let)
(10) I want to thank you again for have me in your home for the summer holidays. (have改为having，因为介词后接动名词作宾语)
(11) I had always wanted return to the village after moving away. (return前加to，因为want 后要接不定式)
(12) It was very kind of them to meet me at the railway station and drove me to their home. (drove 改为drive，因为drive 与其前的to meet 并列，此处的drive 为省略to 的不定式)
(13) I look forward to hear from you soon. (hear改为hearing，因为其前的to 是介词)
(14) Play football not only makes us grow up tall and strong but also gives us a sense of fair play and team spirit. (第一个play改为playing，因为动词原形不能用作主语)
(15) I was often a little tired after a day’s work and watch TV demands very little effort. (watch改为watching，因为动词原形不能用作主语)
1. A lot of money has been spent to buy the book.
2. You will have to pay the cost of send a postcard.
3. What he did was puzzled.
4. I will spend a week reading and prepare for the examination.
5. Charles and Linda do all of these things as well as climbed buildings.
6. Yesterday I had my bad tooth pulling out.
7. I heard her singing a song which moved me to tears.
8. I made a terrible mistake. I regretted not to take your advice.
9. When we reached the top of the mountain, we stopped having a rest before we went down the mountain.
10. There’ll be a good film tonight, remember seeing it on time!
11. The game was over, she went home.
12. When speaking, you must make yourself hear.
13. She pretended not seeing me when I came in.
14. Abraham Lincoln was considered being one of the greatest of all American presidents.
15. Following by the officers, the general inspected the army.
16. There is something wrong with my computer, and it needs repaired.
17. Don’t burn the falling leaves on the ground.
18. Losing in thought, he almost ran into a car in front of him.
19. I enjoy to listen to the classic music.
20. Judge by what he wears, he is a farmer.
【答案与解析】
1. to buy改为buying。

2. send改为sending。

介词of后要求用动名词作宾语。

3. puzzled改为puzzling。

puzzling表示“令人疑惑不解的”意思。

4. prepare改为preparing。

preparing和前面的reading是并列结构。

5. climbed改为climbing。

as well as是介词短语，后面接动名词或名词。

6. pulling改为pulled。

have the tooth pulled out表示“请人拔牙”的意思。

7. singing改为sing。

从后面可以看出来，“我”听完了整首歌曲，强调动作的全过程，用不定式作宾补。

8. to take改为taking。

用动名词表示对已发生过的事情的后悔。

9. having改为to have。

stop的目的是have a rest。

10. seeing改为to see。

还未看电影。

11. was改为being。

独立主格结构。

12. hear改为heard。

make oneself heard意为“使别人听到自己的话”。

13. seeing改为to see。

pretend后面要求接不定式作宾语。

14. being改为to be。

consider后用不定式作宾补。

15. following改为followed。

过去分词表被动。

16. repaired 改为repairing。

动名词主动形式，表被动意义。

17. falling改为fallen。

过去分词作定语，强调动作的完成。

18. losing改为lost。

be lost in thought 表示“陷入深思”。

19. to listen改为listening。

enjoy后面用动名词作宾语。

20. Judge改为Judging。

Judging by…为一固定说法。