作为情态动词不需要例如cannot do 类似dare not do;作为实义动词是 dare not to do sth
实义动词
1.敢; 敢做
He didn't dare to speak to her.
他不敢和她说话.
I dare you to jump over the stream.
我谅你不敢跳过这条小河.
2.激（某人做某事）；问（某人）有没有胆量（做某事）；谅（某人）没胆量（做某事）
I dared him,but he didn't.
我向他挑战,可是他不敢应战.
3.敢尝试；敢做；敢冒…的险,敢冒(风险)
The explorers dared the dangers of the ice north.
探险者们敢于冒北方冰雪严寒的危险.
情态动词：
1.敢,竟敢
I daren't ask her for a rise.
我不敢向她要求加薪.
I don't know whether he dare try.
我不知道他是否敢试一试.
She wanted the money badly,but she daren't ask for it.
她急需用钱,但却不敢要.
He dare not mention the subject again.
他不敢再提起那个话题.
We're so late I daren't look at my watch.
我们太迟了,我连手表都不敢看一眼.
I daren't think how much it's going to cost.
我没敢想这得花多少钱.
He dared not show that he was pleased.
他不敢表示自己觉得高兴.
Dare you tell him the news?
你敢告诉他这个消息吗?
I show him my new blouse but I dared not tell him how much it cost.
我给他看了我的新衬衫,但没敢告诉他花了多少钱买的.