1.定义:具有名词、形容词及副词性质并具有时态、语态变化。
2.形式:(以do为例)
一般时:主动语态为to do;被动语态为to be done。
进行时:主动语态为to be doing;被动语态为to have been done。
完成时:主动语态为to have done;被动语态为to have been done。
完成进行时:主动语态为to have been doing;被动语态为to have been done。
3.用法:
(1)用作主语:
To speak good English is not easy.
or: It is not easy to speak good English.
(采用形式主语 it 以避免头重脚轻)
It took me an hour to do the work.
(2)用作宾语:
She decided to take the examination.
I hope to meet him soon.
(3)宾语补足语:
They expected us to help them.
He wants his son to study hard.
金牌重点:
不定式作宾补,如谓语动词是感官动词,使役性动词(see, hear, notice, watch, make, have, let...),则不定式符号“to”须省略,但在被动语态中不能省。
I heard them sing in the classroom.
I made her clean the room.
The girl is heard to sing an English song.
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