高一英语 Unit3 Celebration导学

概要：ds: observelearn-summarize--useLearning 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,canStepII: Match the verbs to their meanings.(A级)1 have to a) not necessary2 don’t have to b) necessary3 can c) not allowed/not possible4 can’t d) allowed/ possible5 ought to e) not advisable6 ought not to f) advisableStepIII: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.________________________________

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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)

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?