There are a lot of things to be done.

　　She was too young to be assigned such work.

　　功用: 不定式可以作主语 , 宾语 , 表语 , 定语 或是状语 .

　　a. To scold her would not be just.

　　b. We are planning to build a reservoir here.

　　c. One of our main tasks now is to mechanize agriculture.

　　d. Do you have anything to declare?

　　e. We have come to learn from you.

　　不带to 的不定式:

　　在动词+ 宾语+不定式结构中, 如果动词是表示感觉意义的see, hear, watch, smell, feel, notice等, 或是表示致使意义的 have, make, let等, 其后的不定式结构不带to.

　　John made her tell him everything.

　　这类结构转换为被动语态时, 后面的不带to 的不定式一般还原为带to 的不定式.

　　She was made to tell him everything.

　　在 had better, had best, would rather, would sooner, would just as soon, might as well, cannot but 等搭配之后, 动词不定式也不带to.

　　Id rather not have eggs and bacon for breakfast.

　　They cannot but accept his term.

　　在make do, make believe, let drop, let fall, let fly, let slip, let drive, let go of, let there be, hear say, hear tell, leave go of等固定搭配中, 用不带to的动词不定式.

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