Grammar新颖的课程导入教案

Book 6 Module 1 Grammar didn’t need to do and needn’t have done Part 1 Explanation

Get the students to read the following materials and understand the usage of didn’t need to do and needn’t have done. 1．Didn’t need to do表示“没有必要做某事”，用于过去时态，也可用didn’t have to代替。若用于现在时态，可用doesn’t (don’t) need to do(实义动词)或needn’t do(情态动词)或don’t have to do。

He said you didn’t need to/have to wait for him.他说你不必等他了。

We needn’t/don‘t have to go yet; the show doesn’t start for an hour.

我们还不必出发，表演还要一个钟头才开始。

(1)在回答带有need的问句时，肯定答语用must，否定答语用needn’t或don’t have to。

—Need I finish the work before ten?我需要在十点前完成工作吗？

—Yes, you must.是的，你必须完成。

—No, you needn’t./No, you don’t have to.不，你不必在十点前完成。

(2)didn’t need to do或needn’t do, don‘t have to do都表示“不必做某事”，若表示“必须”做某事则用must do；若表示“一定不要做，不准，不应该”，则用mustn’t。

You mustn’t drive so fast in the street. 在街上你一定不要开这么快。

We mustn’t waste any more time.

我们不能再浪费时间啦！

(3)在回答带有must的问句时，否定回答常用needn’t或don’t have to，表示“不必”，而不用mustn’t。

—Must I come back before dark？我必须在天黑前回来吗？

—Yes, you must.是的，你必须回来。

—No, you needn’t (don‘t have to)．不，你不必回来。

(4)must与have to的辨析：

①must表示的是说话人的主观看法，而have to则往往强调客观。

The film is not interesting. I really must go now. 这电影没意思，我现在就走。

I have to go now, because my mother is in hospital. 我现在必须走了，因为我妈妈正在住院。

②两者的否定意义不同，mustn’t表示“禁止，不许”，don’t have to表示“不必”。

You mustn’t go there.你不能去那儿。

You don’t have to go there.你不必去那儿。

2．Needn’t have done表示“本没有必要做某事而实际却做了”。

You needn’t have taken a taxi here, for it was very near to my house.

你本没有必要打出租车来的，因为那儿离我家很近。

注意：needn’t have done表示“做了本来不必做的事”，didn’t need to do表示“没有必要做而实际上也没有做某事”。

You needn’t have told him the news; he knew it already. 你不需要告诉他这个消息，他已经知道了。

I didn’t need to clean the windows. My brother did it.

我没有必要擦窗户，我哥哥已经擦了。

Part 2 Discussion Answer any questions asked by the students.

Part 3 Practice Fill in the blanks with the given words 1. I didn't need ____________ (get) up early this morning，so I stayed in bed till noon. 2. He needn't ________________ (give) you some help，for you could finish it by yourself. 3. Our holidays ___________________(ruin) by the weather；we might just as well have stayed at home! 4. — Why didn't Tom come to the party last night? — He might not ______________ (want) to see me. 5. — You mustn't park your car here，sir；it's the entrance to our building. — I mustn't，mustn't I？And _____________ are you going to do about it? 6. I didn't need to get up early this morning, so I _______________ (stay) in bed still 8:30 a.m. 7. — Is John coming by train? — He should, but he ________ not. 8. — How did you do in the test? —

Not so well. I could ________________ (do) much better but I misread the directions for

Writing. 9. — We need ___________ person badly to be in charge of this design. — Shall the new comer have __________ try? 10. The public transportation is very convenient in that big city, so there shouldn't be any difficulty in _____________________(travel) around.