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动词不定式的主要用法
一、动词不定式在句子中不能独立充当谓语, 没有人称和数的变化。
二、动词不定式是由“to+动词原形”构成(有时可以不带to)。动词不定式的否定形式是“not+动词不定式”。
三、动词不定式短语具有名词、形容词和副词等的功能, 可在句中用做多种句子成分。
主语 宾语 表语 定语
状语 宾补
动 词 宾 语
此种情况可按固定搭配或句式去记。
例:would you like to see my photos?
Kevin planned to visit his uncle 类似用法的词还有:start, want, agree, hope, begin, decide, agree, love, like, hate, prefer等。
I found it very difficult to get a job.
(it为形式宾语)
点击规律:
这些动词后面除接不定式外, 还可以接动名词, 意思区别不大。
提示板:like doing指经常性动作,而like to do指一次性的动作。
I like swimming,but I don‘t like to swim now.
我喜欢游泳, 但我现在不想游。
stop, forget, remember, go on, try等词或短语后面可以接不定式。
点击规律:上述动词后面接不定式和接动名词意思大不相同。
提示板:
stop to do sth. :
停止一件事,去做另一件事。
stop doing sth. :停止正在做的事。
例如:
When the teacher came in, the students stopped talking;
当老师走进来时, 学生们停止说话;
when he came out, the students stopped to talk.
当老师走出去时, 学生们又开始说话。
2) 思考: forget, remember, go on,try等词或短语后面接不定式和动名词用法有何区别?
点击规律:在find/feel+it+adj.+to do sth.句型中,it是形式宾语, 真正的宾语是后面的动词不定式。
返回
如:
The man downstairs found it difficult to get to sleep.
I feel it easy to recite the text.
点击规律: 某些动词或短语后面既可以接动词不定式作宾语, 又可接动名词作宾语, 二者用法上的区别可以通过造句子加以区分, 如上页的stop例句。
表 语
放在连系动词be后面
例句: His wish is to become a scientist.
Our duty is to protect the environment.
The first important thing is to save the
soldiers’ lives. 当务之急是抢救战士们的生命。
点击规律: 动词不定式在句中作表语时, 通常对连系动词前面的名词进行诠释说明。
返回
定 语
动词不定式做定语放在所修饰的名词 、代词的后面。
例: He is the first person to sail around the world.
I have a lot of work to do.
The doctor said he could do nothing to help the boy.
点击规律: 动词不定式若在句中作定语, 常某某在被修饰的名词、代词之后。
返回
提示板: 如果动词不定式和前面所修饰的词构成动宾关系, 且动词是不及物动词, 切记不要忘掉后面的介词。如:
I have a small bedroom to live in.
Have you got some pens to write with?
作 状 语
a.目的状语: 放在go, come, use, live, in order等词后面.如:
I come to see you.
He runs fast in order to get there in time.
They brought in photos of their families for me to
look at
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b. 原因状语: 放在sorry, glad, surprised, disappointed,
excited等词后面。(有些资料上把这类称为不定式在表示心理、情感、评价等的形容词后, 对其进行补充说明, 作形容词补足语)如:
I am glad to see you here.
I am sorry to trouble you.
c. 作结果状语。如:
Some of the apples are hard to reach.
The room is large enough to hold 1000 people.
宾语补足语
(1)在多数复合宾语及物动词后要带to:
tell, ask, want, order, teach, invite, warn, wish, help, get, wish, 等词后面常接不定式作宾补。
例: I asked a friend to read it to me.
I tell him not to go there by bus .
Edison‘s mother taught him to read and write.
返回
(2) 在表示感觉、致使等意义的动词(see, watch, hear, feel, make, let, have, observe, notice, help等)后不带to 的不定式作宾补。如:
The boss makes them work 16 hours a day.
I heard her sing in the next room.
提示板: 若变成被动语态, 在上述结构中, 不定式符号to要加上。
如:
They are made to work 16 hours a day by the boss.
She was heard to sing in the next room.
“疑问词+不定式”用法
不定式前可带what,who,which,where, when, how, whose, 等疑问词, 这种不定式短语在句中作宾语、宾语补足语、
主语等。
例: He didn’t tell me where to go. (直宾)
I don’t know what to say now.(宾语)
I don't know what to do next. (宾语)
He taught us how to use the computer.(宾语补足语)
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It's still a question how to get there.(主语)
在初中阶段还涉及到“不定式被动语态一般式(to be+过去分词)”
例: There are twenty more trees to be planted.
根据句意, 用括号内所给动词的适当形式填空。
1. It's time for us ____ (have) supper.
2. Would you like ____ (go) shopping with me?
3. It took us half an hour _______ (work) out the problem.
to go 主语
to go 宾语
to work
主语
4. He is old enough _____ (join) the army.
5. I feel strange _______ (have) a twin sister.
6. I am very glad _______ (meet) you here.
7.They prefer ______ (stay) at home rather than go out.
to join
结果状语
to have
形容词补足语(原)
to meet
形容词补足语(原)
to stay
宾语
8. We saw them_______ (come) into the room just now.
9. What he said made me_____ (feel) sorry.
10. I am sorry.I forgot_____ (tell) you the news.
11. His plan is _______ (spend) a few days in the mountains.
to come
宾补
to feel
宾补
to tell
宾语
to spend
表语
12. Have you got anything _____ (say)?
13. Have you decided which one ________ (choose)?
14. Do you know when______ (start)?
15. He is too weak ________ (carry) the big stone.
to say 定语
to choose
定语
to start
不定式短语作宾语
to carry
结果状语
THANK YOU
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