have the nerve 有勇气、有胆量做某事，好意思、厚脸皮做某事

Will you have the nerve to go for it?

你有勇气去努力试一试吗？

I'm afraid I don't have the nerve to say things like that.

我恐怕是没这个厚脸皮说那样的话。

疯狂练习吧！