必修3教案 Unit1 Festivals around the world-Reading

Nothing shall stop us from fighting against pollution．(决心)
7．在表示将来的时间、条件状语从句中，不能用will（这时的will不是情态动词，而是助动词，帮助构成将来时）。如：
If it will rain tomorrow, we shall not go to the mountain village．(误)
If it rains tomorrow, we shall not go to the mountain village．(正)
当情态动词will表示意愿或决心时，是可以用于条件状语从句的。如：
If you will listen to me, I’ll give you some advice on how to learn English．
如果你愿意听我的话，我将给你提点学习英语的建议。
If you will come this way，the manager will meet you．
请您往这边走，经理现在要见你。
8．should除表示必要或义务外，还可表示推测或可能。如：
The American friends should be here now．
“should／ought to＋have＋过去分词”既可表示本该做而事实上没有做的事，也可以表示惊讶、责备、赞叹等情绪。如：
You should have told her about it the day before yesterday．
It’s wonderful that you should have achieved so much in these years．
“情态动词＋have＋过去分词”是很重要的一种句型，除should外，may, might, must, couldn’t, needn’t, ought to等都可以用于这一句型，但要注意使用不同的情态动词句子的意思就有所不同。
9．ought to与should意思接近，大多数情况下二者可以互换，但是should谈的是自己的主观看法，ought to则更多反映客观情况，在谈到法律、义务和规定时使用。如：
We should／ought to help each other and learn from each other in our work．
She is your mother, so you ought to support her．
We ought to go and see Mary tomorrow, but I don’t think we will．
10．need用作情态动词，仅用于否定句和疑问句，而不用于肯定句。在肯定句中要用must, have to, should, ought to或将need当作行为动词使用。如：
We need report the matter to the boss immediately．(误)
We must report the matter to the boss immediately．（正）
We need to report the matter to the boss immediately．（正）
dare的用法也一样。
dare与need 的用法
1) dare作为情态动词,主要用于疑问句,否定句和条件从句中,一般不用于肯定句。
a. How dare you say I’m unfair?
b. He daren’t speak English before such a crowd, dare she?
c. If he dare break the rule, he will be punished.
2) need表示”需要”或”必须”,作情态动词用时,仅用于否定句或疑问句、条件从句中。“有……必要”。在肯定句中一般用must, have to, ought to或should代替。
a. You needn’t come so early.
b. —Need I finish the work today?
—Yes, you must. / No, you needn’t.
c. If you need go there, please let me know.
3) dare和need常用作实义动词,有时态、人称和数的变化。所不同的是,在肯定句中, dare 后面通常接带to的不定式; 在否定和疑问句中, dare后可接带to或不带to的不定式。
a. I dare to swim across the river
b. He doesn’t dare (to) answer.
c. We need time and money.
d. The dining room needs/ wants/ requires cleaning every day.
= The dining room needs/ wants/ requires to be cleaned every day.
e. Does he need to take the medicine four times a day?
需要注意的几点:
1. 表示猜测，can一般不用于肯定句中，除非是“经验之谈” 。这时can可以表示客观的可能性,并不牵涉具体的事情是否会发生;要表示某事发生的可能性别时需要用could，may， might。
Children can often get ill suddenly．（小孩常常可能突然生病）
Certain things in the home can be dangerous，especially if you have young children．（家里的某些东西可能有危险，尤其是有小孩的时候。）上面两句可以看作医务工作者或抚养过孩子的人说的话，属“经验之谈”。
Accidents can happen on such rainy days.
2．may和might都不用于疑问句中。如：
（正）Can／Could it be cloudy tomorrow？
（误）May／Might it be cloudy tomorrow？
3．must的否定式是can't／couldn't，不是 needn't或mustn't。
4．would ＋V原形：想必现在／过去……；现在／过去可能……
He would be back today／yesterday．想必他今天／昨天回来了。（他今天／昨天可能回来了。）
5．should／ought to＋V原形：想必现在／将来会……
The dinner should／ought to be ready now．想必晚饭现在已备好。
He should／ought to ring up this afternoon．想必他今天下午会打电话的。
6．will ＋V原形：将来一定／准会……
Try your best，and your wish will come true．尽力吧，你的理想准会实现的。

【高考链接】
1. Black holes ______ not be seen directly, so determining the number of them is a tough task.（2006上海）
A. can B. should C. must D. need
2．— What’s the name? （2006北京）
 — Khulaifi. _______ I spell that for you?
A. Shall B. Would C. Can D. Might
3. — Must he come to sign this paper himself?
   —Yes, he           . (2006广东)
A. need B. must C. may D. will
4. There's no light on —they______ be at home. (2006 全国I)
A. can't B. mustn't C. needn't D. shouldn't
5. Some aspects of a pilot’s job __________be boring, and pilots often _________work at inconvenient hours. （2006湖南）
A. can; have to B. may; can C. have to; may D. ought to; must
6. —Mum, I’ve been studying English since 8 o’clock.         I go out and play with Tom for a while?
  —No, I’m afraid not. Besides, it’s raining outside now .(2004辽宁)
A．Can’t B．Wouldn’t C．May not D．Won’t
7. Children under 12 years of age in that country ________ be under adult supervision when in a public library. (2004上海)

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