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新一轮中考复习备考周期正式开始,初中升学网为各位初三考生整理了各学科的复习攻略,主要包括中考必考点、中考常考知识点、
新一轮中考复习备考周期正式开始,初中升学网为各位初三考生整理了各学科的复习攻略,主要包括中考必考点、中考常考知识点、各科复习方法、考试答题技巧等内容,帮助各位考生梳理知识脉络,理清做题思路,希望各位考生可以在考试中取得优异成绩!下面是《2018中考英语知识点:助动词用法讲解》,仅供参考!
助动词用法讲解 助动词一般没有词意,不能单独作谓语动词。其作用在于帮助构成各种时态、语态、否定、疑问等。 1、助动词be(am, is, are, was, were, being, been)的用法 (1) be后跟现在分词构成进行时态。 Who is playing the violin?谁在拉小提琴? She was reading a book then.那时她正在读书。 (2)be后跟过去分词构成被动语态。 He was asked to do the work.有人要他干这件工作。 You are invited to attend the meetintg.有人邀请你参加会议。 (3)be 后跟不定式作谓语,有如下几种情况: ①表示计划、安排将要发生的事。 Who are we to meet?我们要见谁呀? I'm to have supper with John this afternoon.今天下午我要与约翰一起吃晚饭。 ②表示指示、命令,否定式表禁止。 You are to see the headmaster today.今天你必须去见校长。 You are not to enter the room without permission.未经允许你不能进入房间。 ③表示义务、责任等,同should。 You are to be back before 5.你得在5点钟以前回来。 What is to be done?该干什么。 ④表示可能性,与情态动词may, can同义。 Such books are to be found in any library.这种书任何图书馆都有。 Not a sound was to be heard.一点声响也没有。 ⑤表示后来发生的事,可以用来表示命运或注定 They say good-bye, little knowing that they were never to meet again.他们告别了,没想到再也不能相见了。 He was to regret the decision.他有一天会后悔做出这一决定的。 ⑥用于习语 Where am I to go? 我该向何处去? What am I to do? 我该怎么办? 2、助动词have(has, had, having)的用法 (1)助动词have可以构成完成时或完成进行时 He has been a doctor for 10 years.他当医生十年了。 This is the place I have been longing to visit.这就是我一直渴望参观的地方。 (2)和不定式构成谓语,表示客观上不得不做的事情。 We've missed the train. We'll have to wait for another one.我们己经误了火车,我们只能等下一列。 -Do we have to start work?我们得立刻工作吗? -No. We don't have to.不,不必了。 3、do(does, did) 的用法 (1)构成疑问句或否定句 How did you know about it?你是怎样知道这件事的。 He does not smoke. 他不抽烟。 (2)加强语气。 He did tell that.他的确告诉了此事。 Do come and see us.一定来看我们。 (3)代替前面刚出现的动词,避免重复。 -You like popular music, don't you?你喜欢流行音乐,是吧? -Yes , I do.是的,我喜欢。 He speaks French as fluently as she does.他讲法语和她讲的一样流利。 (4)用于倒装句中。 Never did he pay attention to my words.他从不注意我的话。 only then did I understand the importance of English.只是那时,我才了解到英语的重要性。 (5)构成否定的祈使句。 Don't be so careless.不要那么粗心。 Do not hesitate to come for help.只管来求助。 4、shall(should)和will(would) 的用法 (1)shall(should)用于第一人称的将来时中,单纯表示来 I shall think it over.我要好好考虑一下。 When shall I see you again?我何时再见到你? I rang up to tell her that I should leave for London. 我打电话告诉她我要去伦敦。 (2)will用于第二、第三人称的将来时态中,在现代英语中可以用于所有人称 He will be 30 next month. 他下月将是30岁。 You will have an English test tomorrow.明天你有英语小测验。 He wanted to know when you would finish the writing.他想知道你何时完成写作。本文标题:2018中考英语知识点:助动词用法讲解
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