规则九、不定式做状语一般有两种：目的状语和出乎意料的结果状语(表示顺其自然的结果用-ing形式)。另外，某些形容词(表喜、怒、哀、乐)做表语后跟不定式可以表示原因

例19._____, you need to give all you have and try your best.

A Being a winner B To be a winner C Be a winner D Having been a winner

解析：根据句意“要想成为获胜者，你要付出所有，尽最大努力”，此处表目的，所以答案为B。

例20. The news reporters hurried to the airport, only _______ the film stars had left.

A. to tell B. to be told C. telling D. told

解析：本句句意为“记者们匆匆赶到机场，却被告知明星们已经走了”，表出乎意料的结果常常用only to do，所以答案为B。

例21. The glass doors have taken the place of the wooden ones at the entrance, ________ in the natural light during the day.

A. to let B. letting C. let D. having let

解析：本题句意为“玻璃门替换了木头门，自然光就进来了”，自然光进来时顺其自然的结果，所以用doing, 答案为B。

例22.How glad I am ___________ you!

A. seeing B. to see C. saw D. having seen

解析： 本题是I am glad to see you 的感叹句形式，to see you 是原因状语，答案为B。

规则十、非谓语动词的否定规则是在非谓语动词前加not，有not to do, not doing, not having done, not to have done几种形式

例23______that he was in great danger, Eric walked deeper into the forest.

A. Not realized B. Not to realize C. Not realizing D. Not to have realized

解析：本题考查doing的否定形式not doing，答案为 C。

例24. What worried him most was ______ to visit his sick child.

A. his being not allowed B. his not being allowed

C. his not allowing D. having not been allowed

解析：本题考查being done的否定形式not being done; his 为not being done的逻辑主语，所以答

案为B。

例25. Sarah has decided ________ away on holiday this summer.

A. don’t go B. to not go C. not going D. not to go

解析：本题考查to do的否定形式not to do, 所以答案为D。