初二英语知识点大全:动词不定式用法详解
尽管动词不定式用法灵活多样; 尽管有些动词或短语后面既可以接to do 又可以接 doing ,但只要我们用心观察,发现还是可以找到规律的。与其说是动词不定式,到还不如说是动词“定式”。因为我们可以大体上把它分为三类形式, 即: do / to do / doing
动词不定式没有人称和数的变化,在句中不能独立作谓语, 是非谓语形式的一种。但动词不定式具有名词、形容词和副词特征,在句中可以作主语、宾语、宾语补足语、定语、表语和状语等多种成分。另外,动词不定式具有动词特点,可以有自己的宾语和状语,组成动词不定式短语。动词不定式的肯定形式是 to+do;其否定形式是 not to+do。
下面以动词不定式在句中的作用来予以详细说明, 希望同学们从中找到规律,下次FOX 嘉洲来和你一起讨论并解决问题。
1. 作主语
可以直接作主语。如:
To see is to believe.
但在英语中,常用it 作形式主语,真正的主语即动词不定式放在后面。如: It's wrong to play tricks on other people.
It's our duty to keep our environment clean and tidy.
点击规律:动词不定式在句中作主语时,常放在It is +adj.(形容词)+to do sth.或 It is +n.(名词)+to do sth.句型中,it 仅作形式主语。
2. 作宾语
a.want ,decide ,agree 等动词后面跟并且只能跟不定式。如:
We agreed to start early.
She wants to be a doctor.
b.love ,like ,begin ,start ,hate ,prefer 等词后面可以接不定式。
点击规律:上述动词后面除接不定式外,还可以接动名词,意思无很大区别。 提示板:like doing指经常性动作,而like to do指一次性的动作。如: I like swimming,but I don't like to swim now.我喜欢游泳,但我现在不想游。 c.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:
1)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。
例句:When the teacher came in,the students stopped talking;when he came out,the students stopped to talk.
当老师走进来时,学生们停止说话; 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? d. 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。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,如上面stop 例句。
3. 作宾语补足语
a.tell ,ask ,want ,order ,teach ,invite ,warn ,wish ,help ,get 等词后面常接不定式作宾补。如:
I tell him not to go there by bus .
Edison's mother taught him to read and write.
b.let ,make ,have ,see ,hear ,feel ,watch , notice 后面接不带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.
4. 作定语:放在被修饰的名词、代词后面
例句: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,常放在被修饰的名词、代词之后。
提示板:如果动词不定式和前面所修饰的词构成动宾关系,若动词是不及物动词,切记不要忘掉介词。如:
I have a small bedroom to live in.
Have you got some pens to write with?
5. 表语:放在连系动词be 后面
例句:His wish is to become a scientist.
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。
6. 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.
b. 原因状语:放在sorry ,glad ,surprised , disappointed ,excited 等词后面。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.
7. 与what ,who ,whose ,when ,where , how 等疑问词连用,作宾语、宾语补足语、主语等。如:
I don't know what to do next.(宾语)
He taught us how to use the computer.(宾语补足语)
It's still a question how to get there.(主语)
初二英语知识点大全:动词不定式用法详解
尽管动词不定式用法灵活多样; 尽管有些动词或短语后面既可以接to do 又可以接 doing ,但只要我们用心观察,发现还是可以找到规律的。与其说是动词不定式,到还不如说是动词“定式”。因为我们可以大体上把它分为三类形式, 即: do / to do / doing
动词不定式没有人称和数的变化,在句中不能独立作谓语, 是非谓语形式的一种。但动词不定式具有名词、形容词和副词特征,在句中可以作主语、宾语、宾语补足语、定语、表语和状语等多种成分。另外,动词不定式具有动词特点,可以有自己的宾语和状语,组成动词不定式短语。动词不定式的肯定形式是 to+do;其否定形式是 not to+do。
下面以动词不定式在句中的作用来予以详细说明, 希望同学们从中找到规律,下次FOX 嘉洲来和你一起讨论并解决问题。
1. 作主语
可以直接作主语。如:
To see is to believe.
但在英语中,常用it 作形式主语,真正的主语即动词不定式放在后面。如: It's wrong to play tricks on other people.
It's our duty to keep our environment clean and tidy.
点击规律:动词不定式在句中作主语时,常放在It is +adj.(形容词)+to do sth.或 It is +n.(名词)+to do sth.句型中,it 仅作形式主语。
2. 作宾语
a.want ,decide ,agree 等动词后面跟并且只能跟不定式。如:
We agreed to start early.
She wants to be a doctor.
b.love ,like ,begin ,start ,hate ,prefer 等词后面可以接不定式。
点击规律:上述动词后面除接不定式外,还可以接动名词,意思无很大区别。 提示板:like doing指经常性动作,而like to do指一次性的动作。如: I like swimming,but I don't like to swim now.我喜欢游泳,但我现在不想游。 c.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:
1)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。
例句:When the teacher came in,the students stopped talking;when he came out,the students stopped to talk.
当老师走进来时,学生们停止说话; 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? d. 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。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,如上面stop 例句。
3. 作宾语补足语
a.tell ,ask ,want ,order ,teach ,invite ,warn ,wish ,help ,get 等词后面常接不定式作宾补。如:
I tell him not to go there by bus .
Edison's mother taught him to read and write.
b.let ,make ,have ,see ,hear ,feel ,watch , notice 后面接不带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.
4. 作定语:放在被修饰的名词、代词后面
例句: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,常放在被修饰的名词、代词之后。
提示板:如果动词不定式和前面所修饰的词构成动宾关系,若动词是不及物动词,切记不要忘掉介词。如:
I have a small bedroom to live in.
Have you got some pens to write with?
5. 表语:放在连系动词be 后面
例句:His wish is to become a scientist.
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。
6. 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.
b. 原因状语:放在sorry ,glad ,surprised , disappointed ,excited 等词后面。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.
7. 与what ,who ,whose ,when ,where , how 等疑问词连用,作宾语、宾语补足语、主语等。如:
I don't know what to do next.(宾语)
He taught us how to use the computer.(宾语补足语)
It's still a question how to get there.(主语)