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(tài)差別： have有時態(tài)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(tài)一起。must為情態(tài)動詞, 無時態(tài)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(如體力和腦力方面)，意為“__________”等can表示時，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(tài)度。(主要用在否定句、疑問句或驚嘆句中)

Can this be true? ______________________

How can you be so careless! ___________________

This cannot be done by him. __________________

4)在變否定句時，直接在后加上“not”,可縮寫成_________或___________, 但不能寫成cann’t。例如：

(變成否定句) He can swim. → _______________________

3 ought意思是______________后面跟帶有 to 的動詞不定式否定式為_________________。(C級)

You ought to read these books if you want to know 高中政治 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的區(qū)別：

1.ought to語氣略強。 2.should較常用。

3.ought to在美國英語中用的很少，而should卻相當常用。

4.ought to屬正式用語。

練一練：(C級)

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?

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