我不知道怎么用英语表达用英语怎么表达？

我不知道他是个教师还是别的'什么。

I don't know if he's a teacher or what.

我不知道我一阵大哭持续了多久。

I don't know how long my crying jag lasted.

太好了。我不知道怎样才能报答你。

It was very kind. I don't know how I can ever repay you.

我不知道你怎么能忍受那样的噪音！

I don't know how you tolerate that noise!

我不知道。我没有参与那场争论。

I don't know. I wasn't in on that particular argument.