高中生《怎么学好高中理科？》各科学习主题班会课件 1.ppt

高中生《怎么学好高中理科？》各科学习主题班会课件 1.ppt人教课标版高二选修7
Unit 1
Grammar
动词不定式
动词不定式由“to+动词原形”构成,可以在句中作主语、宾语、表语、定语、状语、补足语等,但不能作谓语。不定式可以有自己的逻辑主语,即for sb. to do sth. 。
动词不定式的时态和语态
1. 不定式作主语
To finish this report took him a week.
To see is to believe.=Seeing is believing.
It’s not easy to have a good knowledge of a foreign language .
单个不定式作主语时,谓语动词用单数
若不定式太长,往往用it作形式主语,不定式置后
保持主表平衡
动名词与不定式做主语时的比较:
动名词表示的动作通常是表示经常的、
习惯性的动作或状态或一个泛指的动作,
不定式则通常表示具体的动作。如:
As a child, she felt that visiting sick people
was a duty and a pleasure.
Watching news on TV has e a
routine for me.
一直不做就是作恶。
Doing nothing is doing ill.
他说: “继续这样下去是无用的。”
He said, “To go on like this is useless.”
我很荣幸被邀请参加这个晚会。
It’s an honor for me to be invited to the
party.
2. 不定式作表语
What I would suggest is to put off the meeting.
My job is to give first aid to the patient.
What I can do to help you is give you some money.
What to do next is collect money for the people in need.
To say is to believe.
不定式用来解释前面do 的内容时,常省to
保持主表平衡
▲:不定式用在介词but, except, besides
后时如果这些介词前有行为动词do的
各种形式, 那么介词后的不定式不带to,
相反则带to。
(1) She could do nothing but cry.
(2) I have no choice but to go.
(3) What do you like to do besides sleep.
3. 不定式作宾语
I decided to have my money back.
He deserved to win because he had tried his best.
I make it a rule to travel once a year.
4. 不定式作宾补
1) 带to的不定式作宾补。很多动词如: allow, order, force, permit, tell, want, wish, forbid, advise, persuade, warn等后面作宾补的不定式都带to。
. He didn’t allow us to smoke in his house. 他不允许我们在他的家里吸烟。
2) 不带to的不定式作宾补。使役动词make, have, let; 感官动词see, watch, observe, hear, listen to, notice等后面作宾补的不定式不带to。
. He made a face and made everybody laugh. 他做了一个鬼脸, 逗得大家都笑了.