Dare you talk back to your father? 你敢跟你父亲顶嘴吗？
No, I dare not (=daren't). 我不敢。
He dare not tell me the truth.
(= He didn't dare to tell me the truth.) 他不敢跟我说实话。
How dare you! 你胆子真大！
How dare you talk to your mother like that!
How dare you smoke in your father's face!
Don't you dare talk to me like that! 你胆敢再这样跟我讲话！
Don't you dare smoke in my face! 看你还敢不敢再在我面前抽烟！
I dare say = I suppose/I believe
I dare say that she is a liar. 我敢说她是个骗子。内容来自 听力课堂网：http://www.tingclass.net/show-5855-216979-1.html