高中英语情态动词课件精品

1、Grammar，情态动词用法，情态动词的语法特征，1)情态动词不能单独谓语，除了ought和have以外，后面只有没有to的不定式。2)情态动词没有人称、数的变化，但有些情态动词(如can、will)有一般和过去时态的变化。3)情态动词的“时态”形式不是时间差异的主要表现形式，在很多情况下，情态动词的现在和过去形式可以用来表示现在、过去和未来的时间。1.can 1)表的能力可以成为表的能力，意味着可以通过身体、精神或技术等做某事。I can climb this pole.he is only four，but he can read . fire cant destroy gold。can和

2、could:2)表猜测、可能性否定和疑问结构中的Can the news be true？It cant be true。what can he possible mean？他可能是什么意思？可用于表示积极句子中的理论可能性(暂时可能性)。a house in the center of London can cost a lot of money .attending the ball can be very exceing。the road can be blocked .3)表示请求或允许(类似于may的意思)在口语中很常见。Can (May) I come in？我能进来吗？Can I

3、 smoke here？我能在这里抽烟吗？2) could的主要用法是A. could是can的过去时态，表示与过去相关的能力，表示推测： eg . we all knew that the young man could nt be a doctor。B. could可以代表请求，“允许”，而不是can。你能机智地提问或发表意见吗，Could you lend me your dictionary？Could I use your bike？Yes，you can . im afraid I could nt give you an answer today。can和be able to d

4、o之间的差异，时态：can有当前时间和过去(could)，be able to do有多种时态。在未来的情况下，以及郑智薰谓语动词中，应该使用be able to do。e.g. so far，doctors have been able to do very little to treat(治疗)this kind of disease(疾病).Can表示一致的能力，Be able to表示通过客观能力和努力实现的能力1。I cantswim。But I am sure I will be able to swim through more practing . 2 . the fire s

5、pread through the hotel，But every one was able to get out 3 .when the boat sank he was able to swim to the bank，You cant be too careful she could nt but agree to my idea。the girl couldnt help crying。I cant thank you enough。the film couldnt be any worse。I burst out laughingI couldnt help it、Can或could

6、的否定形式是习惯短语Cant.too.Cant。enough.不管怎样。即可从workspace页面中移除物件。即可从workspace页面中移除物件。不合分。即可从workspace页面中移除物件。即可从workspace页面中移除物件。铁路超高but do不得不进行Cant help doing，Cant help it必须进行Cant.无法比较。即可从workspace页面中移除物件。即可从workspace页面中移除物件。但是(对于“最佳”)，may和might: may通常表示请求，允许；比Can更正式的May I come in？You may go now。(许可)b .表示发言

7、人的推测，“也许”:一般只用于正面和负面的句子。eg .-I believe the man is from England。-but I may be wrong。the guest may arrive this afternoon。在疑问句中表示可能性can。示例：Where can he be？他会在哪里？c .表示祝愿。但： eg. May you succeed！May you have a good journey！Might被：多人用于间接引语中，表示过去的可能性和允许。 she said that he might take her bike。她说她可以用她的自行车。现在的许

8、可比may更委婉，一般用于疑问句(包括间接疑问句)，不用于肯定句或否定句。 Might I have a word with you？我能和你谈谈吗？you may well be right there is nothing to do，so I may as well go to bed。the film is so boring，And we might as well not have come to see it。may well最有可能是may/might as well，Might as well have done是May.do/be.回答愿望，may引起的问题时，否定词是mu

9、st not，意思是“许可渡边杏”、“渡边杏”、“渡边杏”。梅I comin？Yes，you may。否，you cant no，you may not。no，you mustnt no，youd better not。will和would:1。will是助动词还是情态动词？威尔是用来构成未来的助动词。用于表示“意志”、“决心”、“请求”的情态动词。Would也是如此。Eg. I will you something important。让我告诉你一些重要的事情。(语调动词)，will you tell her that im here？请告诉我我在这，好吗？(模态动词)，If you giv

10、e him time，Tom will talk and talk for hours。every Saturday evening they will play chess togeter the door wont open ill do my best to help you。will you please give me a message when you see him？-write to me when you get home。-I will，重复习惯性总是，总是，最终，表示功能可以或行的意向，第二人称，询问对方的意向或要求对方回答命令型，Would表示郑重的要求或邀请(第二人

11、称)will请帮帮我们，好吗？When I had some troubles，he would encourage me。we all tried to atop him smoking in bed but he woulden。“过去的习惯，意志”是：“Would和Used to do是“过去经常”，Would -过去习惯的动作(现在可能有这种习惯)used to do-过去习惯的动作和状态(现在没有这种习惯)，E.g. He，状态，shall和should:1。shall在构成来世时用来构成助动词。Shall用于征求对方的意见，“决心”表示是情态动词。eg : perhaps I sh

12、all pay a visit to England this winter。可能这个冬天去英国观光。(构成一般未来，助动词)，Shall we go by train，Mom？妈妈，坐火车去吗？(用于征求对方意见的模态动词)I shall go at once。我必须马上去。(表“决心”，情态动词)，1)第1，第3人称，用来征求对方的意见，What shall I wear on the journey？肖恩we dance？2)shall用于第二人称时间表、承诺、警告、命令和威胁。”应该是可能的。“if he passes the examination，he shall have a h

13、oliday。you shall have it back tomorrow。3)第二、第三人称用于法律和法规要求等。应该，应该”its required in our regulation that students shall go to school on time . persons under 18 shant be employeed in night work .2 .should表示义务、建议、建议等，表示“必须”。(ought to)students should respect teachers。the boys should nt be playing footpball

14、；they should be at school . its 43336930，they should be in new York by now . he ought to succed，As he is so diligent。it is strange that it should be so hot today。I dont understand why she should have made such a mistake。should it rain tomorrow，the meeting will be postponed。建议、建议、义务、责任、一般、常识性的推测(正常情况

15、下)实际上与疑问词一起使用，表示思考、好奇、惊讶等“最终”，在条件语句中“在情况下”，must和haveto，1.must、yes、you must.no、youneed nt、I dont like this TV set。web must buy a new one。there was no more bus。they had to walk home。2.表示“必需”的意思时，must和haveto略有不同。Must强调主观意见，haveto强调客观要求。另外，haveto可以用于更多时态。youmustbethenewtearcher . hemmustbejecting . ther

16、eisnoboyhere . theymusthaweeall gone home。3.must表示对某人某事的推测，“肯定”，“肯定”通常用于肯定的句子。must have done、he must come and worry her with question、just when she was busy coking the dinner .of course，After I gave her my advice，she must go and do the opposite。how old are you，madam？If you must know，im twice my sons age，4。must表示“hansako，hansako，dare”，表示做不愉快的事，need和dare，实际动词，模态动词，实际动词和情态动词，积极文章，真实，爱，e . g . she needs tes，e . g . she need stay at home today . e . g . he dare jump from the high wall。疑问，e . g . do