我再也不想和她做朋友了，但我不知道如何告诉她。

I no longer want to be friends with her but I don't know how to get the message across.

《柯林斯英汉双解大词典》

“那感觉多好啊，但我不知道如何写诗。”她说。

"How good it would feel, but I don't know how to write poems," she said.

youdao

它看起来很刺激，但我不知道如何冲浪。

It looks exciting, but I don't know how to surf.

youdao

I admit I don't see how to do it, but I don't see that it's impossible."

我承认,我不知道如何去解释,但我不认为那是不可能的

耶鲁公开课 - 死亡课程节选

I know that's not possible, but how do we reconcile this?

我知道这是不可能的，但到底如何达成协调？

普林斯顿公开课 - 人性课程节选