我只是不知道该说些什么：因为我从没想过，见到母亲一事会成为现实。

I just didn't know what to say, because I never thought seeing my mother would ever come true.

youdao

唔，我不知道该说些什么。

B: Well, I don't know what to say.

youdao

这时我不知道该说些什么了，突然，大门关上了。

I did not know what to say. The gate was now closed.

youdao