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《Grammar and usage(2)： Reported speech： statements,questions and impera》公开课PPT课件优质课下载
To-infinitive
1.to do as a subject
The cat said, “To take roller coaster is terrible ”.
不定式短语作主语时，可以直接放在句首，但在很多情况下，尤其是在疑问句和感叹句中，往往放在谓语之后，而用先行代词it作形式主语。
The cat said, “It’s terrible to take roller coaster.”
How long did it take you to take roller coaster?
How terrible it is to take roller coaster!
过山车. wmv
不定式作主语常见句型：
a) It is + adj. (easy, important,
difficult…) + 不定式
b) It is + n. (a pity, a pleasure, one’s duty, a shame…) + 不定式
c) It takes/needs/requires + some time (hours, months, days, patience…) + 不定式
It requires patience to be a good teacher.
It’s my duty to teach you how to
be a student of Nanjing No.3 Middle School.
2.to do as a predictive
Our most important task now is to make a plan.
当句子的主语是aim, idea, policy, question, suggestion, wish, task, duty, job, purpose等或者主语是what引导的名词性从句时，后面可以用不定式做表语，用以说明主语所包含内容。
注：作表语的不定式都带to，但当主语部分有实义动词do时，to可以省略。
Now the only thing we can do is wait.
3.to do as an object
The cat said “Remember not to
take it next time!” (Tips:不定式否定为not to)
a) 可以直接用不定式作宾语的动词很多，如agree, afford, tend, ask, decide, determine, expect, fail, hope, learn, intend, manage, offer, plan, promise, refuse, want, wish