助动词用法讲解.pptx

《助动词用法讲解.pptx》由会员分享，可在线阅读，更多相关《助动词用法讲解.pptx（8页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、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 1、助动词bebe（am,is,are,was,were,am,is,are,was,were,being,been being,been）的用法（1 1）be be后跟现在分词构成进行时态。Who is playing the violin?Who is playing the violin?谁在拉小提琴？She was reading a book then.She was reading a book then.那时她正在读书。（2 2）bebe后跟过去分词构成被动语态。He was asked

2、to do the work.He was asked to do the work.有人要他干这件工作。You are invited to attend the meeting.You are invited to attend the meeting.有人邀请你参加会议。第1页/共8页（3）be 后跟不定式作谓语，有如下几种情况：表示计划、安排将要发生的事。Who are we to meet?Im to have supper with John this afternoon.表示指示、命令，否定式表禁止。You are to see the headmaster today.今天你必

3、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。表示义务、责任等，同should。You are to be back before 5.What is to be done?该干什么。第2页/共8页表示可能性，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。表示后来发生的事，可以用来表示命运或注定They say good-bye,little kn

4、owing 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。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？第3页/共8页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.

5、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。Weve missed the train.Well 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 dont have to.不，不必了。第4页/共8页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

6、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,dont 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。第5页/共8页（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。（

7、5）构成否定的祈使句。Dont be so careless.不要那么粗心。Do not hesitate to come for help.只管来求助。第6页/共8页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。第7页/共8页谢谢您的观看！第8页/共8页