英语四级考试如何复习，什么是重点要点和高频考点，这是很多考生的疑问。对此，新东方在线整理了2023年12月大学习英语四级语法常识：不定式的特殊句型so as to，供各位考生参考。
2023年12月大学习英语四级语法常识：不定式的特殊句型so as to
7.9 省to 的动词不定式
1) 情态动词 ：
2) 使役动词 let, have, make：
3) 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补，省略to。
注意：在被动语态中则to 不可以省掉。
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 可带to，也可不带to, help sb do sth：
7) but和except：but前是动词do时，后面出现的动词用不带to的动词不定式。
8) 由and, or和than连接的两个不定式，第二个to 可以省去：
9) 一般在discover, imagine, suppose, think, understand等词后，可以省去to be：
He is supposed nice.他应该是个好人。
举例：
He wants to move to France and marry the girl.
He wants to do nothing but go out.
比较： He wants to do nothing but go out.
He wants to believe anything but to take the medicine.
典型例题
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 后面接不带to 的不定式，因此选D。
2) Paul doesnt have to be made ___. He always works hard.
A. learn B. to learn C. learned D. learning
答案：B. make后接不带to 的动词不定式，当其用于被动时，to 不可省略。
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