I don't know how this happened.

我不知道这事怎么发生的。

I don't know what to do next.

我不知道接着该做什么了。

I don't know anyone called Scott.

我不认识叫斯科特的人。

No, I don't know the room number.

不，我不知道房间号。

"I don't know," she said fiercely.

“我不知道。”她非常愤怒地说。

No comment. I don't know anything.

无可奉告。我什么也不知道。

I don't know where the money goes!

我不知道钱都花到什么地方去了！

I don't know what she sees in him.

我不知道她看上他哪儿了。

I don't know if I can get it clean.

我不知道我能否把它清理干净。

I don't know what to say.

我不知道说什么好。

I don't know the name of the place.

我不知道那个地方的名称。

I don't know how you stick that job.

我不知道那活儿你怎么受得了。

I don't know how she puts up with him.

我不明白她怎么受得了他。

I don't know if he's a teacher or what.

我不知道他是个教师还是别的什么。

I don't know how you can eat that stuff!

我不明白你怎么能吃那种东西！

I don't know if I can come but I'll try.

我不知道是否能来，但我尽可能来。

I don't know him—he's a perfect stranger.

我不认识他，他是百分之百的陌生人。

I don't know how you tolerate that noise!

我不知道你怎么能忍受那样的噪音！

Honestly, I don't know anything about it.

我真的对此一无所知。

I don't know whether to hate or pity him.

我不知道是该恨他还是该同情他。

I don't know if the painting is authentic.

我不知道这幅画是不是真迹。

I don't know what happened to her husband.

我不知道她的丈夫出了什么事。

I don't know if we can help—it all depends.

我不知道我们能不能帮上忙，一切都得看情况而定。

I don't know why.

我不知道为什么。

I don't know how long my crying jag lasted.

我不知道我一阵大哭持续了多久。

"Of course I don't know her," Roger snapped.

“我当然不认识她，”罗杰恶声恶气地说。

I don't know how I made it through the week.

我不知道自己是怎么熬过那个星期的。

Frankly, I don't know what Paul sees in her.

坦白地说，我不知道保罗看中她什么了。

I don't know how to make polite conversation.

我不晓得怎么说应酬话。

"I'm sure I don't know." Deb tossed her head.

“我确实不知道。”德布甩头说道。