人教新课标必修三 Unit 2 Healthy eating情态动词讲解

1、Unit 1 festivals around the world，grammer，情态动词(Modal Verbs)，情态动词表示说话者对某一行为或状态的态度，认为“可能”、“一定”等。但是其本身意义不完整，不能单独作为谓语动词使用，要和没有to的不定式(即动词原形)一起使用。情态动词没有个人和书的变化。Can and could may and might will and would shall and should must and can t，can and could，So he can carry heavy books .ability could nt open the do

2、or by himself .ability could you open the door，please？Request，Can/could的用法。1.意思是“可以，会”，表示体力或脑力等能力。2.意味着可能，意味着许可，经常在口语中代替5.3。意思是可能，在肯定的陈述中表示可能性，在否定句或疑问句中表示猜测、惊讶等。4.推测过去动作时可以使用的4.can have done是否定句和疑问句中常用的表。E.g. I can speak English。can I keep the book for a few days？You cant be serious。(你不会认真的)she is t

3、wo hours late。what can have happened？Can和be able to的区别1.can和could在表示能力时也可以替换为be able to，因为它只能表示当前时间和一般过去，在需要使用当前或其他时态时可以表示为be able to。如果需要强调过去实际使用了哪些能力，请使用was(were)able to代替could。Was able to说：“试着做点什么。”could说：“有某种能力。”e . g . he is such a good swimmer that he was able to save the boys from drowning th

4、e other day。could的用法1。在过去的背景下，表示过去的能力、许可和可能性。2.如果不出现在过去的语境中，那就是委婉的语气。Could have done表示对过去发生的事情的推测。e . g . I could n t speak English two years ago。where could she have gone？may and might，he may be in his office。=(perhaps he is in his office。)he might be having lunch。=(perhaps he is having lunch。)，may

5、 and might，1)表示可能性，暗示对当前、过去或未来的推测不确定。Might不是may的过去时态，它表示比may可能性小，包含更多的怀疑。He may be very busy now。(很有可能)He might be very busy now。(可能性较小)，may and might，2)意思是许可，可以允许别人做某事，也可以征求对方的同意。he may go now . we may keep the book for two weeks . 3)。May you succeed！May you have a nice trip！5月、MIG、can、could、1。they

6、(can/might)_ _ _ _ _ _ _ _ _ _ _ _ be away for the weekend but I m not starthe(can/could)_ _ _ _ _ _ _ be from America，judging by his accent . 5 .(may/can)_ _ _ _ _ be6.listen，please . you(may not/might not)_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _，might，表示猜测，may，表示许可证，could，表示请求，could，表示猜测，ca

7、n，表示能力，may not，表示不允许，may，might，canthey(can not/may not)_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Tom orrow(can/could)_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ，表示许可，couldnt，could，表示推测，Can not，推测(不可能)，might，推测，will and would，1)自愿或决心等行动(offering to do sth)-you know that book I

8、compel lent you。can I have it back if you ve finished with it？-of course。Ill give it to you this afternoon。(agreement)thanks for lending me the money，Ill pay you back on Friday。(promise)，Will and would，2)习惯(habit，custom) this old man is strange。he will sit for hours without saying angything。we would

9、 sit around grand pa after supper，Listening to his stories。表示第二个人说would比will更委婉的请求。例如：will you come this way，please？Would you open the window？shall and should，1)shall的用法a.shall表示在疑问句中排第一，用第三人称征求对方的意见。shall we put off the sports meeting until next month？Shall Tom go there with me tomorrow？B.shall表示第二

10、人称、第三人称、说话者给对方的命令、警告、承诺或威胁等。you shall fail if you don t work harter。(警告)he shall have the book when I finish reading it。(约定)He shall be punished。(威胁)，shall and should，2) should的用法a. should表示建议、建议和命令。you should go to class right away . b . should表示，期望表达合理的推理(prediction，优选)或明显的结果(意思是“可能性”)几乎是真的。It is

11、three oclock，the fooball game should begin now . Mary took dancing lessons for years，so she should be an excellent dancer。1 .we _ _ _ _ _ _ _ _ _ _ smoke here，Because the worker is carrying some petrol . 2 . it is dangerous。you _ _ _ _ _ _ _ _ _ _ _ leave the room immediately . 3 . he _ _ _ _ _ _ _

12、_ _ _ _ _ _ _ _ _ _ _ _ _ _- I _ _ _ _ _ _ _ _ .5。-need I hand in my exercise book at once？-是，You _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ be very titiesit _ _ _ _ _ _ _ _ _ _ _ look nice on you。will、would、shall、should、must :mustnt、should、would、will、must、must、must(1)表达、指示表达、指示主要指客观的法律和规定，通常译作“必须，必须”。(。

13、Mustnt是指禁止，you must have a passport if you want to go abroad . 2)主观命令，禁止主观命令，禁止时主要是指说话者的主观命令或强烈建议。you can go out with your friend but you must come back before 11 at night。-must I hand in the exercise today？-否，you need n t .，must and cant，3)表示猜测，语气非常肯定，几乎肯定的意思，通常用于表示肯定的句子。否定是cant，表示不可能。You must be i

14、ll。I can see it from your face。he can t be at home。I saw him in the classroom just now .must and have to、1。must用于一般问题，明确回答must否定式needn t or don t have to no ，mustnt表示“禁止，不允许”-must I finish all assignments at a time-yes，you must.no，you need nt.2 .表示“必需”的意思时，must和have to略有不同。Must强调主观意见，have to强调客观要求。h

15、ave to还可以用于更多时态。I dont like this TV set .we must buy a new one。there was no more bus。they had to walk home。not sure、very sure、he might be in the classroom。He may be in the classroom。he could be in the classroom。he should be in the classroom。he must be in the classroom。情态动词的猜测用法，1 .there were already

16、 five people in the car but they managed to take me as well。-it _ _ _ a comfortable journey。()a . cant be b . must nt have been c . should nt be d . could nt have been，d，2 .the fire spread through the hotel very quickly but every one _ _ getout。()a . had to b . would c . could d . was able to，d，exercises，3 .彼得_ _ _ come with us ton