i dont know为什么不用am not（除了Idon）

I have no idea.

我不清楚

I have no idea where he went.

他去哪了我真不清楚。

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I don't get it.

我没明白

Why did you give me that look?

I don't get it.

你干嘛给我那个眼神？真不明白。

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I'm not sure.

我不确定

I'm not sure if it's right to do so.

我不知道这么做对不对。

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I don't have a clue.

我毫无头绪

It's been three days.

And I don't have a clue for God sake.

都已经三天了，我TM竟毫无头绪。

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Beats me.

搞不懂

What you're presenting

here really beats me.

你在这演示的真搞蒙我了。

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Hmm. That's a good question.

嗯，这个问题不错。

-Why don't you like Joe?

-Hmm. That's a good question.

-你为何不喜欢Joe?

-好问题。