I don't understand. 我不明白。 I don't really understand. 我不太明白。 That's not clear. 我不清楚。 I can't see your point. 我不明白你在说什么。 I can't understand what you mean. 我不明白你的意思。 I'm not sure what you mean. 我弄不清楚你想说什么。 I don't know what's what. 我根本不知道这是怎么回事。 It's over my head. 太难了，我弄不懂。 Your guess is as good as mine. 我也搞不清楚。 The more I think about it, the less I understand it. 越想越糊涂。 I don't know what he is driving at. 我不知道他要干什么。 What's she after? 她到底想干什么? I have no idea. 我一点儿都不知道。 I didn't know that. 我怎么不知道。 I don't know. 不知道。/不太清楚。 I don't know for sure. 我不太清楚。 No one knows for sure. 谁也不知道确切的情况。 How should I know? 我怎么会知道? Who knows? 谁能知道?
