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1、英语词汇难点解析need的用法need可以当动词用,也可当助动词用。1 .当动词用时，用法如下：1）他们需要食物。They need food.（疑问句）Do they need food?（否定句）They do not need food.（过去时）They needed food.2）他需要出席本会。He needs to attend the meeting.（疑问句）Does he need to attend the meeting?（否定句）He doesnft need to attend the meeting.（过去时）He had to attend the meetin
2、g.（将来时）He will have to attend the meeting.3）这篇文章需要修订。This article needs revising.This article needs to be revised.2 .当助动词时，只能用于疑问和否定的情况，其用法与其他助动词无 异。4）他需要写什么吗？Need he write anything?比较：5）我不清楚他是否需要写什么？I dont know whether he need write anything.6）他不需要写什么。He need not write anything.比较：7 ）没有人需要写什么。Nobod
3、y need write anything.8 )你只有写名字就行了。You need only write your name.9)你其实不需要那么急的，火车晚点。You need not have hurried. The train is late.注意：Need not have + Vp . p表示实在不必做，但已经做了10 )我们本不该点这么多吃的。We need not have ordered so much food.补充几个最常用的名词句型：a need for something; a need to do something; there is a need; be i
4、n need of.她对友谊的需要(her need for friendship )有必要保护环境(a need to preserve the environment ) 急 需现金(There is a desperate need for cash.) 我们需要资金 (we are in need of funds.不说 we have a need of funds.)have与其他动词的关系一、have作助动词时，可分成两类。L 一般用法：A.帮助动词表示完成失态:1) I have done the work already.B.帮助动词表示完成进行时态：2 ) I have b
5、een studying all day today.C.帮助动词表示完成和被动时态：3 ) The question has been discussed since we arrived.2、特殊用法A . have to可以表达must的非不可的意义。4 ) The last bus leaves in ten minutes, so I have to/must say good-bye now.最后一班公共汽车十分钟后就要开了，我现在非走不可了。(现在时：must=have to ) Father is better now, but I still have to help him
6、 (to ) walk.父亲好多了，但是我还是得扶着他走。5 ) We dont have to /neednt get up early tomorrow as it is a holiday.明天放假,我们不必早起。（由于mustnt的意思表示禁止，而不能表达不必”的意思，所以 得用do not have to表示不必。） If you want to master English, you will have to （而不用 will must） practice it every minute.如果你想精通英语，一定要时刻练习。（由于两个助动词will和must不可并用,所以改用wil
7、l have to表达 将来非得”的意思。） He had to （而不用 must） see the doctor last night.他昨晚非看医生不可。（had to表示过去时）注意：had to如果为下列情形，则可用must表示：6 ） He said he had to /must see the doctor last night.他说昨晚非看医生不可。B. had better表示最好，后接动词原形。10 ） You had better （not） continue working in this company.你最好（不要）继续在这家公司上班。二、have除了可以当助动词
8、之外，也可以当使役动词。have用作使 役动词时，不可用作被动式根据其不同的意义，可分为下列三种结构：1. have +宾语+ VR表示要某人去做某事。) What a woman! She had me show her every hat in the shop!要命的女人！她要我把店里的帽子都拿出来让她看。11 ) My wife and I would like to have you come to dinner one evening soon.我和妻子想请你哪天晚上到家里来吃饭。12 ) The doctor had us keep all the windows open.医生
9、让我们把窗户都开着。注意：如果have不含有使役概念，而表示有的意义时，则用一般不 定式表示目的或结果。但这种用法的have不可用作被动式。13 ) We shall have Mr. Smith to help us.我们有史密斯先生帮忙。14 ) We finally had something to write about.我们终于有东西可写了。2. have +宾语+ Vp.p表示使某事完成；遭受/经历不好的事件。A.表示“使某事完成时；) I had my car washed.我的车洗过了。16 ) They always have their garden looked afte
10、r by a professional gardener.他们的花园都是由职业园丁管理的。注意：这种用法也可用get取代have.17 ) Have your shoes cleaned by the shoe shining boy.去请擦鞋童把你的鞋擦干净。18 ) Get your shoes cleaned!把鞋弄干净。19 ) please have my evening suit pressed. I am dining out.请把我的晚礼服烫一烫，我要出去吃饭。20 ) Get my trousers pressed. Im dinning out.把我的裤子烫好，我要出去吃饭
11、。注意，这种用法的have也不可用作被动式。B .表示遭遇或经历某经验”时。21 ) He had his car stolen last Sunday.他的汽车上礼拜被偷了。22 ) The Whites had their houses broken into by a thief when they were in the United States.怀特一家人在美国期间，家里被小偷偷了。3. have用来表示由于训练、教导、规劝、欺骗等造成的持续现象或结 果时，用下列形式：have + 宾语 + V-ingShell have him eating out of her hand in a week.她能让他在一周后完全受她的控制。24) Ill have you driving in two hours.我两个小时就能教会你开车。