1) 表推测，暗含很大的可能，语气较弱。

①Han Mei ought to know his telephone number.

②There's a fine sunset; it ought to be a fine day tomorrow.

3) ought (not) to have done表示"责备"、"不满"，表示"本(不)应该..."

　　You ought not to have made fun of him. He is not the one you laugh at but learn from. 1

will

1) 表意愿，用于各种人称陈述句。

　　①I will do anything for you.

　　②They will go their own way no matter what happens.

2) 表征求意见，用于第二人称疑问句。

　　① Will you close the window?

　　②Won't you drink some more coffee?

3) 表示某种倾向或习惯性动作。

① Fish will die out of water.

② The door won't open.

4）表示推测，用于第三人称

　　This will be the watch you have lost.

Would

1)表过去的意愿。（would like 指现在）

　　They would not let him in because he was poorly dressed.

2)表委婉地提出请求、建议或看法。

　　Would you mind cleaning the window?

2) 表过去的习惯。

①Every time she was in trouble, she would go to him for help.

②When I was a child, I would get up early and go fishing on Sundays.

need和dare

need和dare既可用作情态动词，也可用作实义动词。用作情态动词时，主要用于否定句和疑问句。用作实义动词时，可用于各种句式。

1) need用作情态动词。

①You need't telephone him now.

②Need he take some money with him?

③I don't think you need worry.

2)need 用作实义动词。M

①You don't need to telephone him now.

②We need to see him off.