中考英语语法知识难点讲练
减小字体
增大字体 1、can 能，可以，表说话人同意，许可还可表客观条件许可，如:You can go now.
提建议或请求时可用can I, can you表客气，如Can I buy you a drink?
can和be able to表能力时的区别。
can表一般具有的能力，be able to表在特定条件下的能力，如:Although the driver was badly hurt, he was able to explain what had happened.
2、may
（1）、可以，表说话人同意，许可或请求对方许可。You may go.
（2）、（现在和将来）可能，也许，只用于肯定句和否定句中，如He may not be right.
3、must, have to
must表主观上的必须，have to表客观上的必须，如:It's getting late. I have to go. -Must I go now. -Yes, you must.
(No, you needn't./ No, you don't have to.)
4、need, dare这二词有实意动词和情态动词两种词性，如用作实意动词后接动词不定式to do，如用作情态动词后接动词原形。Need I go now? --Yes, you must./No, you needn't.)
5、shall用于第一人称疑问句中表说话人征求对方的意见或向对方请求，如，Shall we begin our lesson?
用于二、三人称陈述句，表说话人命令、警告、允诺、威胁等口吻，如: You shall fail if you don't work harder.
6、should表应该，意为有责任，有义务。如:We should try our best to make our country more beautiful.
7、will表有做某事的意志、意愿、安心、打算，如 "Will you lend me your book?" "Yes, I will."，
8、should have done表应该做而未做
must have done表对过去事实的肯定推测
could have done表本可以做某事
9、判断句：肯定句用must, 否定句用can't, 不太肯定用may, might
He must be in the office now.
He must have gone to bed, for the light is out.
He can't be in the office. He is at home.
He couldn't have cleaned the classroom, because he didn't come here today.
He might be in the office, I am not sure.
He might have cleaned the room, I suppose.
II． 例题
例1，They _______ to walk in the street at might.
A. didn't dare B. not dared C. not dare D. dared not
解析，该题答案为A， 此空需选一动词作谓语，因为后面是to walk, didn't dare是行为动词dare过去时态的否定形式。
例2，When he was very old, Mr. Smith _______ sit for hours without saying a word.
A. would B. should C. must D. used
解析，该题答案为A, would此处表过去的倾向性，习惯性动作，意为"总是"如: When we were children, we would go swimming every summer.
（十一）句子种类
I． 要点
句子按使用目的可分为陈述句、疑问句、祈使句和感叹句；按结构又分为简单句、并列句和复合句。
1、陈述句的否定
（1） 在含有宾语从句的主从复合句中，当主句的谓语动词是think, expect, believe, suppose, guess, fancy, imagine等，且主句主语是第一人称时，宾语从句谓语的否定习惯上要移到主句谓语上，如: I don't think he is right.
（2） 含有否定意义的副词never, seldom, hardly, scarcely, rarely, barely的句子应视为否定句，如: I have never been there before.
2、反意疑问句
（1） need和dare 既可作情态动词，又可作实意动词，在反问部分须加以区别，如We needn't leave, need we? We don't need to leave, do we?
（2） 陈述部分出现否定意义的副词或代词如never, seldom, few, hardly, little等时，反问部分须用肯定形式如：He seldom comes, does he?
（3） 陈述部分用不定代词作主语时，反问部分的主语用it ，如：Nothing can stop me, can it?
陈述部分用everybody, everyone, somebody, someone，等作主语时，反问部分常用it，有时也用they，如:Everybody knows that, don't they?
（4） 陈述部分包括used to 时，反问部分可有两种形式，如: You used to get up early, usedn't (didn't) you?
（5） 陈述部分是"there + be"结构时，反问部分用there，如:There's something wrong with you, isn't there?
（6） 陈述部分是含有宾语从句的主从复合句时，反问部分的主语和谓语应和主句保持一致，如: He never told others what he thought, did he?
但，如果是I think , I believe等 +宾语从句时，反问部分须和从句的动词保持一致，如，I don't think he is right, is he? I don't believe he does that, does he?
3、感叹句
用what或how,
What a beautiful park it is.
How beautiful a park it is.
How beautiful the park is.
How we worked!
4、祈使句
Take care!
Don't stand there.
Please open the door for the old lady.
II．例题
例1，Don't forget to post the letter, _______ ?
A. will you B. do you C. won't you D. shall you
解析：该题答案为A， 在否定句、祈使句后只用"will you"?，但肯定的祈使句后可用如，Wait for me, will (won't, can, can't, could) you?
例2，Let's go out for a walk, _______ ?
A. will you B. won't you C. shall we D. do we
解析：该题答案为C，let's…后加上shall we来表语气婉转、客气，而在let us后加上will you。
例3，He hardly writes to you, _______ ?
A. doesn't he B. does he C. do they D. has he
解析：该题答案为B，hardly否定副词，反问部分要用肯定形式。
（十二）各种从句
I．要点
根据从句在句中的句法功能，从句可分为名词性从句、定语从句和状语从句。
1、 名词性从句
（1） 主语从句
What he wants is a piece of paper.
It is believed that he can solve the problem.
注：主语从句的谓语动词用单数。
（2）宾语从句
I don't know how to solve the problem.
Do you know where he lives?
（3）表语从句
The problem is who can help me.
This is why I came here.
（4）同位语从句
I have no idea where he went.
I heard the news that he would come.
同位语从句用that引导，常跟在fact, idea, news, promise, thought, message, hope, belief, doubt等词后，that在从句中不作任何成分。
2、定语从句
在复合句中，修饰某一名词或代词，或修饰整个主句的从句叫做定语从句，引导定语从句的关系代词有who, whom, whose, which, that, as,和关系副词when, where, why。
提建议或请求时可用can I, can you表客气，如Can I buy you a drink?
can和be able to表能力时的区别。
can表一般具有的能力，be able to表在特定条件下的能力，如:Although the driver was badly hurt, he was able to explain what had happened.
2、may
（1）、可以，表说话人同意，许可或请求对方许可。You may go.
（2）、（现在和将来）可能，也许，只用于肯定句和否定句中，如He may not be right.
3、must, have to
must表主观上的必须，have to表客观上的必须，如:It's getting late. I have to go. -Must I go now. -Yes, you must.
(No, you needn't./ No, you don't have to.)
4、need, dare这二词有实意动词和情态动词两种词性，如用作实意动词后接动词不定式to do，如用作情态动词后接动词原形。Need I go now? --Yes, you must./No, you needn't.)
5、shall用于第一人称疑问句中表说话人征求对方的意见或向对方请求，如，Shall we begin our lesson?
用于二、三人称陈述句，表说话人命令、警告、允诺、威胁等口吻，如: You shall fail if you don't work harder.
6、should表应该，意为有责任，有义务。如:We should try our best to make our country more beautiful.
7、will表有做某事的意志、意愿、安心、打算，如 "Will you lend me your book?" "Yes, I will."，
8、should have done表应该做而未做
must have done表对过去事实的肯定推测
could have done表本可以做某事
9、判断句：肯定句用must, 否定句用can't, 不太肯定用may, might
He must be in the office now.
He must have gone to bed, for the light is out.
He can't be in the office. He is at home.
He couldn't have cleaned the classroom, because he didn't come here today.
He might be in the office, I am not sure.
He might have cleaned the room, I suppose.
II． 例题
例1，They _______ to walk in the street at might.
A. didn't dare B. not dared C. not dare D. dared not
解析，该题答案为A， 此空需选一动词作谓语，因为后面是to walk, didn't dare是行为动词dare过去时态的否定形式。
例2，When he was very old, Mr. Smith _______ sit for hours without saying a word.
A. would B. should C. must D. used
解析，该题答案为A, would此处表过去的倾向性，习惯性动作，意为"总是"如: When we were children, we would go swimming every summer.
（十一）句子种类
I． 要点
句子按使用目的可分为陈述句、疑问句、祈使句和感叹句；按结构又分为简单句、并列句和复合句。
1、陈述句的否定
（1） 在含有宾语从句的主从复合句中，当主句的谓语动词是think, expect, believe, suppose, guess, fancy, imagine等，且主句主语是第一人称时，宾语从句谓语的否定习惯上要移到主句谓语上，如: I don't think he is right.
（2） 含有否定意义的副词never, seldom, hardly, scarcely, rarely, barely的句子应视为否定句，如: I have never been there before.
2、反意疑问句
（1） need和dare 既可作情态动词，又可作实意动词，在反问部分须加以区别，如We needn't leave, need we? We don't need to leave, do we?
（2） 陈述部分出现否定意义的副词或代词如never, seldom, few, hardly, little等时，反问部分须用肯定形式如：He seldom comes, does he?
（3） 陈述部分用不定代词作主语时，反问部分的主语用it ，如：Nothing can stop me, can it?
陈述部分用everybody, everyone, somebody, someone，等作主语时，反问部分常用it，有时也用they，如:Everybody knows that, don't they?
（4） 陈述部分包括used to 时，反问部分可有两种形式，如: You used to get up early, usedn't (didn't) you?
（5） 陈述部分是"there + be"结构时，反问部分用there，如:There's something wrong with you, isn't there?
（6） 陈述部分是含有宾语从句的主从复合句时，反问部分的主语和谓语应和主句保持一致，如: He never told others what he thought, did he?
但，如果是I think , I believe等 +宾语从句时，反问部分须和从句的动词保持一致，如，I don't think he is right, is he? I don't believe he does that, does he?
3、感叹句
用what或how,
What a beautiful park it is.
How beautiful a park it is.
How beautiful the park is.
How we worked!
4、祈使句
Take care!
Don't stand there.
Please open the door for the old lady.
II．例题
例1，Don't forget to post the letter, _______ ?
A. will you B. do you C. won't you D. shall you
解析：该题答案为A， 在否定句、祈使句后只用"will you"?，但肯定的祈使句后可用如，Wait for me, will (won't, can, can't, could) you?
例2，Let's go out for a walk, _______ ?
A. will you B. won't you C. shall we D. do we
解析：该题答案为C，let's…后加上shall we来表语气婉转、客气，而在let us后加上will you。
例3，He hardly writes to you, _______ ?
A. doesn't he B. does he C. do they D. has he
解析：该题答案为B，hardly否定副词，反问部分要用肯定形式。
（十二）各种从句
I．要点
根据从句在句中的句法功能，从句可分为名词性从句、定语从句和状语从句。
1、 名词性从句
（1） 主语从句
What he wants is a piece of paper.
It is believed that he can solve the problem.
注：主语从句的谓语动词用单数。
（2）宾语从句
I don't know how to solve the problem.
Do you know where he lives?
（3）表语从句
The problem is who can help me.
This is why I came here.
（4）同位语从句
I have no idea where he went.
I heard the news that he would come.
同位语从句用that引导，常跟在fact, idea, news, promise, thought, message, hope, belief, doubt等词后，that在从句中不作任何成分。
2、定语从句
在复合句中，修饰某一名词或代词，或修饰整个主句的从句叫做定语从句，引导定语从句的关系代词有who, whom, whose, which, that, as,和关系副词when, where, why。
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