office.
A.to have been built up B.to be built
7. 不定式的否定形式
不定式的否定形式由not或never加不定式构成。
(1) We decided____ because of the bad weather.
A. not to go out B. to not go out C don’t go out D. doesn’t go out 注意：谓语动词的否定和不定式的否定不同的意义
I did not promise to wake him up. 我没有答应叫醒他。 I promised not to wake him up. 我答应了不叫醒他。
二 、动词不定式的用法
动词不定式除了不能单独作谓语外，几乎能担任句子中所有的句子成分。
（一） 动词不定式作主语 不定式具有名词的特征，可在句子中充当主语。
8．不定式短语在句首作主语：
(1) _______is more important than to finish quickly . A. that answer correctly B. answering correctly C. To answer correctly D.answer quickly
9．用it作形式主语
在很多情况下，人们通常用it作为形式上的主语，而把不定式真正的主语移到谓语之后，使句子结构显得平稳一些。． It is + 形容词 + of sb + to do 结构
10.在“It is +形容词+ of sb +不定式”
结构中，形容词往往表示人物的性格和特征，如 kind： (1) It's kind ____you to think so much of us.
难为你这么为我们着想。 A. for B. of C. about D. with
11.silly（傻的）:
(1) It is silly__you to make such
mistake.
A. for B. of C. about D. with
12. good:
(1) It is good__you to do this.
A. for B. of C. about D. with
13. unwise:
(1) It is unwise __you to do this. A. for B. of C. about D. with
14.clever:
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