1、作实义动词，有各种词形变化，后面一般加动词的不定式“to do”。2、作名词，意思为挑战、果敢行为，例如for a dare or on a dare在激将法的鼓动下。3、作助动词，只有时态变化，无人称变化，一般用于疑问句、否定句或条件句，或与hardly、never、no one等连用。

例句：1、Few people dared to ｄｅｃｌａｒｅ their opposition to the regime.

很少有人敢宣称他们反对这个政权。

2、Some of the older boys had dared him to do it.

几个大男孩激他，问他敢不敢干这事。

3、There was something,dare I say it,a little unusual about him.

要我说呀，他这人有那么一点怪。

4、I hardly dared to hope she'd remember me.

我几乎不敢指望她会记得我。

5、He won't dare to break his promise.

他不敢食言。