MU Healthy eating Grammar人教必修三语法点PPT课件

1、第1页/共36页第2页/共36页To learn the use of modal verbs 第3页/共36页Underline the sentences containing modal verbs in the reading passage and use the function words below to explain the meaning of the modal verbs.Intention Duty Permission Possibility Guessing Abilitypossibilitypossibilitypossibilityguessingposs

2、ibility第4页/共36页intentionabilitydutyintentiondutypossibilitypossibilityabilityModal verbs are used to express the speakers meaning of intention, duty, permission, guessing, ability, etc.第5页/共36页1. should和ought toa. should, ought to都可表示“应该”。ought to用于表示按道理应当，常指客观的义务或责任，大多数情况下可用should代替，但比should语气重。e.g

3、. I should help her because she is in trouble. You ought to take care of the baby.第6页/共36页b. 表示劝告、建议或命令时，should 和ought to可通用，但在疑问句中常用 should。ought to的否定式为oughtnt to 或ought not to。e.g. You should / ought to go to class right away. _ I open the window? 我可以开窗吗？ What should we do next?Should第7页/共36页You

4、oughtnt / ought not to (ought to) leave in such a hurry. 你不应该离开的这么匆忙。第8页/共36页c. should, ought to都可表示推测。e.g. He ought to / should be home by now. This is where the oil ought to / should be. should和ought to后面跟动词不定式的完成式, 其肯定句表示“过去应该做而未做”, 其否定句则表示“过去不该做但做了”。第9页/共36页You _ the decision a week ago.你应该在一周前就

5、做决定。I _ such a foolish mistake. 我不应该犯这样愚蠢的错误。多数情况下，ought to可与should互换使用。ought to的反意疑问句用shouldnt替代。should / ought to have madeshouldnt have made第10页/共36页You ought to have helped him with his English, _?A. wont you B. ought not youC. shouldnt youD. wouldnt you第11页/共36页2. must和have tomust的用法 1) 表示主观的义务

6、和必要, 主要用于肯定 句和疑问句, 意为“必须， 得，要”；由must引起的疑 问句，肯定回答要用must或have to, 否定回答要用neednt, dont have to, 意 思是“不必”。 第12页/共36页must的否定形式mustnt表示禁止，意思是“不能，不许”。如： Must I finish the task right now? 我现在必须完成这个工作吗？ Yes, you must. / Yes, you have to. 是的。( No, you _. / No, you dont have to. 不，不必。) You mustnt come here with

7、out permission. 未经允许，你不能来这儿。neednt第13页/共36页have to的用法 1) must表示一种主观的需要，而have to表示 一种客观的需要，意思是“不得不”。如： I have to attend an important meeting this afternoon. 今天下午我必须要参加一个重要的会议。 Mother is out, so I have to look after the shop. 妈妈不在家，因此我不得不照看商店。第14页/共36页2) have to的否定形式是dont have to, 相当于neednt。如： They do

8、nt have to buy a computer at present. 他们目前没有必要买电脑。 第15页/共36页have to的第三人称单数形式是has to，一般过去式是had to，一般将来式是will have to。e.g. Li Hua has to pass an examination before he can start work. My car was broken, so I had to walk home. Itll have to be on a Sunday. Ill be working every other day.第16页/共36页The boss

9、 has given everyone a special holiday, so we _ go to work tomorrow. A. cant B. mustntC. neednt D. shouldnt【点拨】考查情态动词。根据题意, 可知这里表示“没有必要”, 故只能选C项。第17页/共36页 What do you think we can do for our aged parents? You _ do anything except to be with them and be yourself. A. dont have to B. oughtnt toC. mustnt

10、 D. cant 【点拨】根据题意“除了和他们呆在一起做你自己外, 没有必要做任何事情。” 可知这里选择dont have to表示“不必”。故选A项。第18页/共36页3. must和needa. need作情态动词时, 只能用于疑问句和否 定句。构成否定句和疑问句时不借助于 助动词do。 Need I finish the work today? Yes, you must. / No, you neednt.第19页/共36页b. must的肯定形式表示“必须”，否定式 表示“禁止、严禁”。 You must come here. You mustnt take the book awa

11、y from the library. 第20页/共36页Choose suitable modal verbs below to complete the following dialogues.ought/oughtnt to should/shouldnt willmustnt neednt (dont) have to can/cant1. Sam: How can I grow thinner, Mum? Mum: Well, you _ eat food with plenty of fibre that helps you digest better. And you _ sto

12、p drinking cola or eating sweet food.have to should 第21页/共36页Sam: Does it mean I _ eat my favourite fried chicken any more?Mum: Not exactly, if you love fried chicken, you _ give it up. Just eat it less often. You _ worry too much: a little fried chicken _ do you good! shouldnt needntdont have to/ n

13、eednt/ shouldnt willought/oughtnt to should/shouldnt willmustnt neednt (dont) have to can/cant第22页/共36页2. Doctor: You are sick because youve eaten poisonous mushrooms. Where did you get them? Lucy: I picked them in the forest. I know we _ eat fresh vegetables. Doctor: Oh, but you _ eat them until yo

14、ure sure they are not poisonous. Lucy: Thank you, doctor. Ill be more careful next time.have tomustnt ought/oughtnt to should/shouldnt willmustnt neednt (dont) have to can/cant第23页/共36页3. Charles: I wish I could see things clearly in the dark. Tom: Eating carrots _ help you see better. You _ eat som

15、e every day.ought to shouldought/oughtnt to should/shouldnt willmustnt neednt (dont) have to can/cant第24页/共36页1. Samuel, the tallest boy in our class, _ (can / should) easily reach the books on the top shelf. （北京2017）2. My room is a mess, but I _ (neednt / mustnt) clean it before I go out tonight. I

16、 can do it in the morning. （天津2017）选用括号内合适的内容填空。neednt can第25页/共36页3. I love the weekend, because I _ (neednt, mustnt) get up early on Saturdays and Sundays. (北京2016)4. It was really annoying; I _ (couldnt, shouldnt) get access to the data bank you had recommended. (天津2016)needntcouldnt第26页/共36页5. G

17、eorge _ (mustnt, cant) have gone too far. His coffee is still warm. (浙江2016)6. I _ (neednt, couldnt) have worried before I came to the new school, for my classmates here are very friendly to me. (天津2015)needntcant第27页/共36页. 用ought to, ought not to, have to, dont have to, mustnt, neednt填空。1. You _ go

18、 across the road when the traffic light is on red.2. You _ buy a gift, but you can if you want to.3. As students, we _ put more energies into study.4. He _ work overtime in order to finish the task before this Saturday.mustnt / ought not toneednt / dont have toought tohas to第28页/共36页5. Tom _ have to

19、ld me your secret, but he meant no harm.6. The sun is shining brightly in a cloudless sky; it _ be a fine day today.7. You dont look well. You _ go to see the doctor.8. A dog ran in front of my mothers car and my mother _ stop very quickly.ought not toought toought tohad to第29页/共36页1. I _ (得接受) your

20、 suggestion. 2. You _ (你不能来这儿) without permission. 3. You _ (应当去照顾) your brother.4. I think you _ (应当去 看) the doctor. II. Translate the following sentences. have to acceptmustnt come hereshould take care ofought to go to see第30页/共36页5. The teacher told the students that they _ (不应该在课堂上沉默不语) all the

21、time.6. You _ (就得不到 我的支持) if you do such a thing.7. I waited for the train for two hours at the station this morning. Well, you _ (本来没有必要那么早去的).8. “You _ (你千万不 要再喝酒了),” the doctor warned him.mustnt drink any moreought not to / shouldnt keep silent in classshall not get my supportneednt have set off so early第31页/共36页III. 阅读下面的对话，按照句子结构的语 法性和上下文连贯的要求，在空格处 使用合适的情态动词填空。Do you call that a hat? I said to my wife.You _ be so rude about it, my wife answered as she looked at