【高一英语必修一电子课本】高一英语Unit3Celebration导学案

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高一英语 unit3  celebration导学案
lesson3  grammar
tips：all things in their being are good for something.(天生我材必有用)
learning aim: learn the use of the modal verbs have to /not have to , can/can’t, ought to /ought not to
learning methods: observe----learn-----summarize------use
learning steps:
stepi: underline all the following words in the texts and translate them.
have to , don’t have to, ought to, ought not to, can’t,can
stepii: match the verbs to their meanings.(a级)
1 have to              a) not necessary
2 don’t have to         b) necessary
3 can                 c) not allowed/not possible
4 can’t                d) allowed/ possible
5 ought to             e) not advisable
6 ought not to          f) advisable
stepiii:transtrate the following sentences.(b级)
1.1）i can’t go out now, i have to look after my baby .
______________________________________
2）i must find a job,my parents can’t support me any longer.
_____________________________________________
3）— must we hand in our exercise books today?
— yes, you must. (no, you don’t have to/need’t.)
________________________________________________
总结：must 和have to表示___________，但must表示___________观，have to表示_________观（如例句1，2所示）
读一读，记一记:
must与have to有下列几点不同：
　　① must表示的是说话人的主观看法，而have to则往往强调客观需要。
　　  the play is not interesting. i really must go now.
　　  i had to work when i was your age.
　　② must与have to 的时态差别： have有时态的变化,如三单has, 过去时had ,表示 客观上的不得不，能与所有 时态一起。must为情态动词, 无时态的变化 , 表示主观上的必须, 需要。
　　③ 二者的否定意义不大相同。如：
　　  you mustn"t go. 你可不要去。
　　  you don"t have to go. 你不必去。
　　④ 询问对方的意愿时应用must。如：
　　   must i clean all the room?
2 1)can you speak english?
__________________________________________________ can表示能力（如体力和脑力方面），意为“__________”等can表示能力时，还可用be able to代替。如：
i"ll not be able to come this afternoon.
2)表示请求或允许，多用在口语中，意为“__________”等。
— can/could i go now?
— yes, you can.（回答语中不能用could）
 3) 表示惊异、怀疑、不相信的态度。（主要用在否定句、疑问句或惊叹句中） 123
　　can this be true? ______________________
　　how can you be so careless! ___________________
　　this cannot be done by him. __________________
4)在变否定句时，直接在后加上“not”,可缩写成_________或___________, 但不能写成cann’t。例如：
(变成否定句) he can swim. → _______________________
  3  ought意思是______________后面跟带有 to 的动词不定式否定式为_________________。(c级)
you ought to read these books if you want to know how to repair the motorcar.
____________________________________________                
you ought to bring the child here.
_____________________________________________                
you ought not to walk alone at night. _____________________________________________
注意： ought to和should的区别：
　　1.ought to语气略强。     2.should较常用。
　　3.ought to在美国英语中用的很少，而should却相当常用。
4.ought to属正式用语。
练一练：(c级)
1the man in the office____________be mr. black because he went home
 just now.
a. mustn’t   b. may not    c. can’t      d. needn’t
2---can you go surfing with us this afternoon?
----i’d like to , but i ________ look after my sister at home , because my mother is ill.
a. need      b. must      c. have to      d. should
3----can i take this book out of the reading room?
------______. please read it here.
a. certainly        b.no, you needn’t 
c.no, you mustn’t           d.no, you may not
4　----_____ you help me answer the telephone
----ok.
a.     can      b.   should    c.   need      d.   must
5 tom is young but he ____ fly a kite by himself.
a.   can       b.   may     c.    need     d.   must
6  -----could i cross the street here?
　-----of course you _____.
　a.could      b.can       c.are able to    d.will
7-----_______ we attend the party?
-----no, you needn’t. you are free.
a. must       b. can       c.may        d. shall123
stepiii do the exercises on page 82----1.2.
the lowest grade
"professor, i did the best i could on this test. i really don"t think i deserve a zero.""neither do i. but that"s the lowest grade i"m allowed to give."
学生：“教授先生,我这次考试已经竭尽全力了.我真的觉得我不应该得零蛋.”老师：“我也是.但是这已经是我能给的最低分了！”
小结反思：这几个情态动词的用法你掌握了吗？
_____________________________________________123

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