不知道

He was unaware that I was present.

他在场。

He does not know what nerves are.

他什么叫害怕。

They were unaware that war was near.

他们争即将爆发。

The where and when are not known.

地点和时间都。

She hadn't the wit to say no.

她如何回绝别人。

I am perplexed to know what to do.

怎么做才好。

None of the pupils knew the answer.

学生中谁都答案。

I don't know whom to give it to.

把给谁。

I haven’t a clue how to get there.

根本怎么去那里。

She remained in blissful ignorance of these events.

她有幸一直这些事情。

We are in complete ignorance of his plans.

们完全他的计划。

I don't know what profession would suit me.

什么职业适合干。

I have mislaid my key to the door.

把门钥匙放到哪里了。

I'm not sure about rhyming perestroika with balalaika.

perestroika是否与balalaika押韵。

They are uncertain about what to do next.

他们下一步该做什么。

I don't know the cause of his abrupt leave.

他突然离去的原因。

He hasn't the least foreknowledge of this matter.

关于此事他事先一点也。

I don't know he was a gay person.

他是同性恋者。

I don't know what all the fuss is about.

这样大惊小怪是为了什么。

I don’t know all the ins and outs of the case.

这个案子的是非曲折。