构成：to do动词原形
1 To be here at Chritma time i m dream
→It i m dream to be here at Chritma time
2 To go abroad i hi dream
→ It i hi dream to go abroad
3 To a i ea, to do i difficut
→ It i ea to a, it i difficut to do
2 用作宾语v to do 宾语----动作的接受者 I want to bu a come on time
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want b to do wih b to do
get b to do order b to do
find b to be ie b to do
woud ie b to do hee
M wih i to be a cientit
hcaThe bet wa i to oin an Engih cub
I fee better toda
状语----修饰动词，形容词，副词以及全句的句子成分，用作状语的通常是副词，介词短语，不定式和从句等。
1）I went there to ee m teacher 目的状语
2）原因状语，
多用于“b be ad to do……”结构中
eg I fee ha
3）结果状语，
多用于“b be ad to do……”，
“enough to ……”结构中
eg The bo wa too tired to move
7 疑问词who, what, which, where, when, how 加to do可构成不定式短语, 在句中可用作主语、宾语、宾语补足语、表语等。
When to tart ha not been decided
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I don’t now what to do
He can te ou where to get the boo
The quetion i whom to a
句子成分口诀：
主谓宾定状补，句子成分要清楚。句子主干主谓宾，枝叶部分定状补。定语用在主宾前，谓前为状谓后补。还有助词的地得，帮助区分定状补。 观察下列不定式在句中的作用。
1 To ee i to beieve
2 Tom want to ee an aien
3 M brother got ue on TV
4 He wa too ecited to a a word
5 The ad movie made u cr
6 It i imortant for u to drin enough water
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