★should除表示必要或义务外，还可以表示比较肯定的推测或可能性。

　　---When can I come for the phone? I need them tomorrow afternoon.

　　---They should be ready by 12: 00.

The old man is always hunting the lions, so terrible things should happen to him.

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.

You can't imagine that a well-behaved gentleman should be rude to a lady.

语法同步练习

1. -Write to me when you get home.

　- .

　A．I must B．I should C．I will D．I can

2. Mr. Bush is on time for everything. How it be that he was late for the opening ceremony?

　A．can B．should C．may D．must

3. -Is John coming by train?

　-He should, but he not. He likes driving his car.

　A．must B．can C．need D．may

4. -I heard they went skiing in the mountains last winter.

　-It true because there was little snow there.

　A．may not be B． won't be C．couldn't be D．mustn't be

5. -I hear that you've got a set of valuable Australian coins. I have a look?

　-Yes, Certainly.

　A．Do B．May C．Shall D．Should

6. It has been announced that candidates remain in their seats until all the papers have been collected.

　A．can B．will C．may D．shall

7. Oh, I'm not feeling well in the stomach, I so much fried chicken just now.

　A．shouldn't cut B．mustn't have eaten []

　C．shouldn't have eaten D．must have

8. I am going to Shanghai on business next week. Have you anything to your parents?

　A．taking B．to take C．taken D．to be taken

9. -Mr. white is in hospital.

　-I'm sorry to hear that. No wonder I him these days.

　A．haven't seen B．didn't see C．would not see D．won't see

10. We can't think of ourselves only. We should think of we can do more for the people.

　A．that B．which C．what D．how

11. The film is not as popular as .