I don't know what to make of the new manager.
這位新經理，我不知道怎麼評價他才好。
I don't know what you're on about.
我不懂你在談什麼。
I don't know how you can say things like that.
真想不到你怎麼會説出這種話來。
I don't know how she puts up with him.
我不明白她怎麼受得了他。
I don't know if I can come but I'll try.
我不知道是否能來，但我儘可能來。
