dare分别在肯定 否定 疑问句中的用法（及物不及物）请逐个举例,

dare用作实义动词时,dare to do sth 和dare do sth都是正确的
动词有单三形式,各种时态,dare也都有
动词,变否定句时,在前面加don't doesn't didn't,dare也不例外
dare用做情态动词时,和其他情态动词一样,没有单三,后面接动词原形
变否定句时,直接加not,dare not =daren't 就像can not=can't
例如,对于open a window 这个动作来说,如果是情态动词就应该这样说：I dare open a window,否定就是I dare not open a window（否定句在情态动词后加not
1） dare用作实义动词,此时其后的动词不定式可带to也可不带to,且dare有人称和数以及时态的变化.例如：
I dare to jump down from the top of the wall. 我敢从那墙头上跳下来.
She doesn't dare (to) meet her teacher's eyes. 她不敢与老师对视.
2） dare用作情态动词,后跟动词原形,主要用于疑问句、否定句和条件句中.例如：
How dare she do things like that to me? 她怎么敢对我做那种事?
-Dare you catch the mouse? 你敢去抓那只老鼠吗?
-I daren't do that. 我不敢抓.
If you dare say that to our teacher, I would vote for you. 如果你敢向我们的老师说那件事,我就投你一票.
例句与用法:
1. How dare you say such a thing?
你怎敢说出这样的话?

2. I dare say you are right.
我认为你是对的.

3. He dared me to jump over the river.
他激我跳过河.

4. Nobody dared lift their eyes from the ground.
没有人敢把视线离开地面.

5. Don't (you) dare leave the room!
（你）敢离开这间屋子!

6. I ,dare say you are British but you still need a passport to prove it.
我相信你是英国人, 但仍需有护照加以证明.

7. Privatize the national parks? They'd never dare, would they?
把国家公园私营化? 他们绝对不敢, 对吗?

8. He dared his grandfather's displeasure when he left the family business.
他不顾祖父的不悦, 放下了家族的生意.