不明白、不知道

　　I can't tell you.

　　I don't understand. 我不知道

　　I'm not following. /I don't get it.

　　I'm confused.

　　I get it. /I understand.

　　I don't really understand.

　　I don't understand very well.

　　So, was he the thief?

　　That's not clear. 那不太清楚。

　　We should do this first.

　　I can't see your point. 我不明白你在说什么

　　I don't see where you're coming from.

　　I don't see your point.

　　I can't understand what you mean.

　　I can't see what you mean.

　　I don't understand what you're trying to say.

　　I don't get your drift.

　　That's how you do it. 所以应该这样做呀

　　I'm not sure what you mean.

　　I'm not sure I understand.

　　I'm not sure I see what you mean.

　　I don't know if I understand what you're trying to say.

　　I don't know what's what.

　　I don't have any idea what's going on.

　　I don't know anything any more.

　　so, that's the way to use computers.

　　It's over my head. 太难了，我弄不懂

　　It's beyond me.

　　Your guess is as good as mine.

　　How many people live in this town?

　　Your guess is as good as mine. 你要不知道，那我更不知道了

　　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.打算做…

　　I don't know what he intends.

　　I don't know what he is getting at.

　　I don't know what he is trying to do.

　　It's not clear. /That's unclear.

　　That's clear.

　　What's she after? 她到底想干什么?

　　I'm not sure.

　　What's her game?

　　I have no idea.

　　Do you know where my pen is?

　　I have no idea. /I have no clue. /No idea.

　　It's all Greek to me. /I didn't know that.

　　John got married last week.

　　I didn't know that. /That's news to me.

　　I wasn't aware of that. /I don't know.

　　Do you know where she's from?

　　I don't know. /I have no idea.

　　Do you know the way to my house?

　　I don't know for sure. “确切地”

　　I don't know for certain.

　　I'm not absolutely sure.

　　No one knows for sure.

　　Is he married? --How should I know?

　　What is the meaning of life?什么是人生?

　　Who knows? --Nobody knows.

　　No way of knowing.

　　There's no way of knowing.

　　It's impossible to find out.

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