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B.用来加强语气
I do want to have a talk with you.
Do come and see me.
C.用来代替动词词组
Have you finished your work? Yes, I did yesterday.
He plays basketball well. So does his brother.
(4)助动词shall
构成将来时态，单纯表示未来情况
I shall not be back tonight.
(5)助动词will
构成将来时，用于第一、二、三人称。如：
They will move to a new house.
She will not eat any solid food.
注意：
(1)have to 与must的区别
must是情态动词，意思是“必须”、“应该”、“一定要”，后接动词原形。Must的否定形式为mustn’t.构成疑问句时，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，必须”，可用于多种时态。
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 表示过去常常，而现在不再有的习惯。其否定形式为: 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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