demand ，require ，request用法辨析（后面动词或名词从句如何连接）
从语义上看,demand表示有正当权利的要求,因此含有“坚决或强烈要求”的意思.require表示“要求所必须的东西；法律、协定、规章以及其他客观情况的要求”.request则表示“有礼貌的请求或正式的请求”.你可以从下列实例中感受它们在语义上的差别：
The policeman demanded his name and address.警察要求他说出姓名和住址.
I’ve done all that is required by law.我已做到了法律所要求的一切事情.
Many people have requested the next song.许多人要求听下面这首歌.
从语法上看,它们的共同点是：
demand,require和request都可以接that引导的宾语从句,并且都要求宾语从句中使用虚拟语气.
它们的不同点是：
1.require和request都可以接宾语 + to do,而demand没有此种用法.例如：
They required me to keep silence.他们要求我保持沉默.
The letter requested us to leave the house within six weeks.这封信要求我们在六周内搬出这幢房子.
2.require + 动名词时,主动形式的动名词具有被动意义,而demand和request无此种用法.
名词从句
一、基本构成：
主语从句主语（句子）+谓语动词+其他成分Where he will go is unknown.
宾语从句主句主语+谓语+宾语（句子）I don’t know where he will go
表语从句主句主语+系动词+从句（表语）The problem is how we can get so much money
同位于从句名词+从句（同位语）/（定语）We all feel sorry about the news that he failed in the game.
二、考查点：
1. whether 与if（是否）的区别：whether和if都可以引导名词性从句表达“是否”的意思，一般可以互换，但在下列情况下只能用whether:
①引导主语从句，且在句首时。例：Whether he has won the tennis is not known.
It is not known whether/if he has won the tennis.
②引导表语从句时。例The problem is whether he can get a job.
③引导同位语从句时。例：I have no idea whether he will come.
④介词后的whether从句。例：I worry about whether I hurt her feelings.
2.that的使用注意事项：
①位于句首引导主语从句的that不可忘。That he got the first place in the competition surprised all of us
可以转化为：It surprised all of us that he got the first place in the competition
②that 引导名词性从句没有任何意义，在句中只是起到连接作用。注意与what的用法区别what＝the
thing(s) that….
This is what you said! = this is the things/all that you said!
注意理解：It was told in yesterday’s newspaper that what the students had done was praised by the factory.
③省略问题：一般情况下宾语从句中的that可以省略，但是有两个或两个以上的that 引导时，第二、 三个that不能省略。 He told me (that) his father died and that he had to make a living alone.
当that引导的是从句是真正的主语或宾语，it 作为真正主语或宾语时，that不能省略。
Eg：We think it important that college students should master at least one foreign language.
It worried him a lot that his hair has turned white.
It happened that I had seen the film.
We take it for granted that he passed the exam.
3. 在“It is suggested/proposed/ordered/a pity/no wonder/necessary/strange/…＋that从句”结构中，that从句谓语有时用（should）do这样的虚拟语气形式。例如：
It is suggested that we(should) improve the relations between us.
It is a pity that one(should) stay in one place all one’s life.
It is strange that she should have failed to see her own shortcomings（缺点）.
在所有表示“坚持insisit，建议suggest/advise/propose，命令order/demand，要求request/require”意思的动词，名词后面的从句谓语动词都要用虚拟语气！！！其变形也是如此。
The suggestion that we (should) go to visit the zoo today disappoints us!
We should follow the requirements that we not destroy the public equipment.
4. 在“The reason why…is that…”句式中that不要误为because. 例如：
The reason why he didn’t go to school yesterday is that he was ill.
5.where在名词从句中的使用特点：
where在名词从句中有时可以变为the place where,有时可以变为介词＋the place where形式如：
主从：Where(＝The place where)she has gone is still unknown.
宾从：Would you please tell me where(＝the place where) Mr Smith lives?
表从：Your dictionary remains where(＝in/at the place where)you put.
同位从：Have you any idea where(＝of the place where) she is spending her holidays?
6.语序问题：所有从句的语序均为陈述句语序，但在下列情况下不变化语序：
What’s the matter with him? She asked me what was the matter with him.
Who looks after your grandfather? He asked me who looked after my grandfather.
注意：Who do you think is the best student in our class?
What do you think we should buy for our mothers?
7.定语从句与同位语从句的区别：
定语从句一般对前面的名词起修饰限制的作用，而同位语从句一般是对前面的名词内容进行解释说明。比较：
① We expressed the hope that they had expressed.
② We expressed the hope that they would come to china again.
1. require
1）require sth (of sb)
2）require sb to do sth
3）require doing 主动表被动
4）require that-clause〔虚拟语气：(should)+V原〕
2. demand
1）demand sth of/from sb
2）demand to do sth；demand to be done
3）demand that-clause〔虚拟语气：(should)+V原〕
3. request
1）request sth of/from sb
2）request sb to do sth
3）request that-clause〔虚拟语气：(should)+V原〕
从语法上看，它们的共同点是：
demand，require和request都可以接that引导的宾语从句，并且在从句中要使用虚拟语气
它们的不同点是：
A. require和request都可以接宾语 + to do sth.，而demand没有此种用法。
B. require + 动名词时，主动形式的动名词具有被动意义，而demand，request无此种用法。
从语法上看，它们的共同点是：
demand，require和request都可以接that引导的宾语从句，并且在从句中要使用虚拟语气
它们的不同点是：
A. require和request都可以接宾语 + to do sth.，而demand没有此种用法。
B. require + 动名词时，主动形式的动名词具有被动意义，而demand，request无此种用法。 回答者： zj980804 | 二级 | 2011-4-22 11:47 | 检举
只讲解这三个单词做动词的用法如下：
1. require
1）require sth (of sb)
2）require sb to do sth
3）require doing 主动表被动
4）require that-clause〔虚拟语气：(should)+V原〕
2. demand
1）demand sth of/from sb
2）demand to do sth；demand to be done
3）demand that-clause〔虚拟语气：(should)+V原〕
3. request
1）request sth of/from sb
2）request sb to do sth
3）request that-clause〔虚拟语气：(should)+V原〕
袁郝醋酸：[答案] 两者都可表示“要求”,区别如下:一、两者在含义上的区别1.有时可互换.如:They demand [require] my appearance.他们要求我到场.2.两者的细微区别是:demand 通常指坚持其应该有或必要的东西,暗示要求者有权这样做,...
伊金霍洛旗15924542120： 英语词辨析:demand、require、want的区别. - ？
袁郝醋酸：[答案] 【问】 demand,require和request都作“要求”解,它们在语义上有区别吗?(山东潍坊 齐 琪) 【答】 从语义上看,demand表示有正当权利的要求,因此含有“坚决或强烈要求”的意思.require表示“要求所必须的东西;法律、...
伊金霍洛旗15924542120： demand,request,require 三个词的区别 - ？
袁郝醋酸：[答案] require是及物动词,表“要求,需要”,语气比demand要弱一点,如:We require a month's rent as a security deposit.我们要求先付一个月的租金作为保证金. request也是及物动词和名词,着重“要求,请求”之意,语气较弱.如:I do have one ...
伊金霍洛旗15924542120： 请问demand与require有何区别 - ？
袁郝醋酸： demand需求(某种东西).经济学中用demand表示市场对某种商品的需求.人可以demand食物水感情....demands是用来被满足的. require要求(达到条件).公司招人的时候会require应聘者达到某些条件.requirements是用来被达到的.
伊金霍洛旗15924542120： demand require request 怎么区分 - ？
袁郝醋酸： Demand 一般指货物,金额数量上的需求,计划性强一点; require request只是动词和名词的区别,都是要求另人履行,执行;
伊金霍洛旗15924542120： demand和require的区别以及具体的用法是什么?？
袁郝醋酸： requie有请求的意思,比较礼貌,无强制含义. demand有强制意味.一般都是部门机构下令用得比较多.
伊金霍洛旗15924542120： REQUIRE REQUEST DEMAND这3个词语有什么主要区别? - ？
袁郝醋酸：[答案] REQUIRE 是需要 REQUEST 是向人要,请求的意思 DEMAND 是发号令,一定要
伊金霍洛旗15924542120： demand 和 require的区别谁能讲解清楚?谢谢啦 - ？
袁郝醋酸： demand 是要求的意思,一般要求的语气强一点,通常有肯定的态度,就是一定要 require 是需要的意思,一般语气弱一点,多用于自己希望得到的request 请求 需要 要求 命令
伊金霍洛旗15924542120： 英语词辨析:demand、require、want的区别. - ？
袁郝醋酸： 【问】 demand,require和request都作“要求”解,它们在语义上有区别吗?(山东潍坊 齐 琪)【答】 从语义上看,demand表示有正当权利的要求,因此含有“坚决或强烈要求”的意思.require表示“要求所必须的东西;法律、协定、规章...
伊金霍洛旗15924542120： demand request有什么区别 - ？
袁郝醋酸： demand 常用来指一个有权要求别人做某事的人,坚持要对方服从,不希望对方有相反的意见,口气比较强硬.不能接动名词,用法demand of sb to do request request 表示“请求”、“要求”,其语气比demand弱得多,指比较正式但仍有礼貌地提出要求. 1)请求恳求 a request for help恳求帮助 2)要求的事物 3)需要 request sth from sb向某人要求某物
