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B.用來加強(qiáng)語氣

I do want to have a talk with you.

Do come and see me.

C.用來代替動(dòng)詞詞組

Have you finished your work? Yes, I did yesterday.

He plays basketball well. So does his brother.

(4)助動(dòng)詞shall

構(gòu)成將來時(shí)態(tài)，單純表示未來情況

I shall not be back tonight.

(5)助動(dòng)詞will

構(gòu)成將來時(shí)，用于第一、二、三人稱。如：

They will move to a new house.

She will not eat any solid food.

注意：

(1)have to 與must的區(qū)別

must是情態(tài)動(dòng)詞，意思是“必須”、“應(yīng)該”、“一定要”，后接動(dòng)詞原形。Must的否定形式為mustn’t.構(gòu)成疑問句時(shí)，肯定回答一般用must。否定回答用needn’t或don’t have to 表示“不必”。如：

Must I do it now?

Yes, you must   No, you needn’t.

have to 表示“不得不，必須”，可用于多種時(shí)態(tài)。

I missed the train, so I had to take a taxi.

I’m sorry I won’t go with you, I’ll have to go to the bank.

We don’t have to install this new television set.

(2)used to 表示過去常常，而現(xiàn)在不再有的習(xí)慣。其否定形式為: used not to, usedn’t (usen’t) to, didn’t use to.

I used to go to work by bus. Now I go by car.

I used to collect stamps when I was a boy.

Used they to have a lot more free time?

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