高一英語 Unit3 Celebration導學案
高一英語 unit3 celebration導學案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級)
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級)
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.)
________________________________________________
總結：must 和have to表示___________，但must表示___________觀，have to表示_________觀（如例句1，2所示）
讀一讀，記一記:
must與have to有下列幾點不同：
① must表示的是說話人的主觀看法，而have to則往往強調客觀需要。
the play is not interesting. i really must go now.
i had to work when i was your age.
② must與have to 的時態差別： have有時態的變化,如三單has, 過去時had ,表示 客觀上的不得不，能與所有 時態一起。must為情態動詞, 無時態的變化 , 表示主觀上的必須, 需要。
③ 二者的否定意義不大相同。如：
you mustn't go. 你可不要去。
you don't have to go. 你不必去。
④ 詢問對方的意愿時應用must。如：
must i clean all the room?
2 1)can you speak english?
__________________________________________________ can表示能力（如體力和腦力方面），意為“__________”等can表示能力時，還可用be able to代替。如：
i'll not be able to come this afternoon.
2)表示請求或允許，多用在口語中，意為“__________”等。
— can/could i go now?
— yes, you can.（回答語中不能用could）
3) 表示驚異、懷疑、不相信的態度。（主要用在否定句、疑問句或驚嘆句中）