不定式 to 的省略
(1) 使役動詞 let，make，have 等和感官動詞 see, hear 等後省略 to。用於被動語態時必須帶 to。
His mother wouldn't let him go to the movie.
他媽媽不會讓他去看電影的。
His workers were made to work for twelve hours a day.
他的工人們被迫每天工作十二小時。
(2)在動詞 help 後用作賓語或賓語補足語的不定式可以不帶to。當 help 用於被動語態時，其後不定式中的 to 不能省略。
I'll help ( to ) do that for you.
我會幫你做那件事。
We were helped by the teacher to do the work.
我們由老師幫助做這工作。
(3)作表語時，主語從句中有行為動詞 do 時，不定式 to 可以省略。
What he did was ( to ) give up the project.
他所做的就是放棄這個項目。
What I do is ( to ) want you to understand me.
我所做的是想要你理解我。
(4)句中含有行為動詞do，在 but，except，besides, such as 等的後面省略to。
Don't do anything silly, such as marry him.
不要做諸如嫁給他的傻事。
He can do nothing, but go home.
他什麼也做不了，只能回家。
(5)不定式後有 rather than，rather than 後省略 to。
I prefer to stay at home rather than go shopping.
我寧願待在家裡也不要去購物。
(6) why not, had better, would rather, can't but 等詞組後面省略to。
Why not go around our school?
為什麼不逛逛我們的學校？
You had better stay at home.
你最好待在家裡。
(7) 當兩個或兩個以上的不定式並列在一起時，前面的不定式帶to，後面的不定式符號to要省略。
Her job is to take care of the children and wash clothes.
她的工作是照顧孩子和洗衣服。
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