(2)表示请求。用于疑问句中。would语气更委婉。

Will you please take a message for him?

你能给他带个口信吗？

Would you mind cleaning the window?

请你把窗户擦一下，好吗？

(3)表示某种倾向或习惯，would表示过去的习惯。

The boy will sit there hour after hour looking at people going by.

那个男孩常常坐在那里好几个钟头，看着人们走过。

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

每次遇到麻烦，她都会向他求助。

[温馨提示] would和used to的区别

(1)would表示过去习惯性的动作，不涉及现在的情况。

Each time his mother's birthday came，he would buy her a present.

每次到他母亲生日的时候，他都要给她买一件礼物。

(2)used to表示过去经常性或习惯性的动作或状态，现在已经不做了。

He used to be late for school，but now he is used to getting up early.

他过去常常上学迟到，现在他已习惯早起。

7.need 和dare

(1)need 作情态动词，表示"需要；必须"；dare表示"敢；敢于"。常用于否定句和疑问句中，后接动词原形，否定形式分别为need not和dare not。

You needn't answer his question immediately.

你不必立即回答他的问题。

If he dare go，I'll go with him.

如果他敢去，我也跟去。

(2)need和dare常用作实义动词，有时态、人称和数的变化，后面可接带to的不定式。

You don't need to be told twice.

不必告诉你两遍。

Tom didn't dare to do it.