(1) 用於do, does , did , will, shall, can, may, must, would…等助動詞之後。
He didn’t know me at all.
Will she come to the party?
Would it be me?
see : I saw Mary play the piano before.
hear : I heard her sing an English song.
feel : I felt the house shake.
watch : We watched the bird fly in the sky.
notice : I didn’t notice you come.
註 感官動詞後亦可用V-ing(現在分詞)，感官動詞若是被動語態，則用to + V
They were seen to leave the house.
Mary was heard to play the piano.
let : Let me go.
have : Do not do to others what you would not have them do to you.
make : My father made a computer engineer fix the computer.
bid : Bid him wait. * 吩咐 *
* 使役動詞若是被動語態，則用to + V
My father made me go to the hospital to see my grandfather for him.
= I was made to go to the hospital to see my grandfather by my father.
have to 必須 had better 最好… be used to被用來…
used to 以前 why not 何不 be able to 能夠
ought to應該 be going to將會 cannot (help) but = cannot help + V-ing只能…罷了
I would rather study English than (study) Math.(寧…也不…)
You can not love your parents too much. (絕不會太…)
(a) All that … is + (to +)V ( 表事實 )
All that we do everyday is study , study, and study.
= All we do everyday is study , study, and study.
= What we do everyday is study , study, and study.
All that you have to do is (to) say sorry.
= All you have to do is (to) say sorry.
= What you have to do is (to) say sorry.
(b) suggest, require, ask, propose, advise, insist advocate…. 等具有讓步意味的動詞之後的子句(子句中的should可省略 )
The teachers proposed that the student be punished.
I suggest that he come here immediately to explain the situation.
I insisted that he appologize for his own fault.
(c) 虛主詞句型(It is + 形容詞 + that + 子句) 中…. 若形容詞之後的子句具有讓步意味，則子句中的should可省略
It is necessary that the criminal committing rape (should) be emasculated.
It is essential that one (should) get up early for health’s sake.
It is urgent that food and water (should) be sent to the refugees immediately.
It is requested that all committee (should) attend the meeting.
It is imperative that you (should) not be seen.
It is proper that an impenitent criminal (should) receive heavy sentence.
(6) 俗語中常將 go to + V中的 to省略
You had better go (to) live in country; that does your health good.
No problem, I’ll go (to) fix the faucet at once.
註 go to + V意為去做「工作或例行公事」