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省略to 的動詞不定式
1） 情態(tài)動詞 ( 除ought 外，ought to)：
2） 使役動詞 let, have, make：
3） 感官動詞 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作賓補，省略to。
注意：在被動語態(tài)中則to 不能省掉。
I saw him dance.
=He was seen to dance.
The boss made them work the whole night.
=They were made to work the whole night.
4） would rather，had better：
5） Why… / why not…：
6） help 可帶to，也可不帶to, help sb (to) do sth：
7） but和except：but前是動詞do時，后面出現(xiàn)的動詞用不帶to的動詞不定式。
8） 由and, or和than連接的兩個不定式，第二個to 可以省去：
9） 通常在discover, imagine, suppose, think, understand等詞后，可以省去to be：
He is supposed (to be) nice. 他應(yīng)該是個好人。
10）but作介詞，后接不定式結(jié)構(gòu)時，前面謂語動詞部分若含有do的形式時，but后的不定式要省去to，否則要帶to?！?
He wants to do nothing but go out.
He wants to believe anything but to take the medicine.
11）當(dāng)兩個或多個不定時短語由連詞and，but或or連接時，后一個或幾個不定式符號to常省略。但若表示對比、對照關(guān)系時，則不能省略。
He wants to move to France and marry the girl.
The purpose of new technologies is to make life easier,not to make it more difficult.
12）不定式做表語時，一般要帶to，但若主語部分中含有do的各種形式時，符號to可省去。
We've missed the last bus.All we could do now is walk home.
舉例： He wants to move to France and marry the girl.
He wants to do nothing but go out.
比較： He wants to do nothing but go out.
He wants to believe anything but to take the medicine.
典型例題
1) ---- I usually go there by train.
---- Why not ___ by boat for a change?
A. to try going B. trying to go C. to try and go D. try going
答案：D. why not 后面接不帶to 的不定式，因此選D。
2） Paul doesn't have to be made ___. He always works hard.
A. learn B. to learn C. learned D. learning
答案：B. make后接不帶to 的動詞不定式，當(dāng)其用于被動時，to 不可省略。
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