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1·You never know how he is going to react.

你根本不知道他会作何反应。《牛津词典》

2·Hang in there and you never know what is achievable.

坚持下去，你永远无法知道会有什么样的收获。《柯林斯英汉双解大词典》

3·How come we never know what's going on? he groused.

“我们怎么会不知道发生了什么事？”他抱怨道。《柯林斯英汉双解大词典》

4·I never know what to expect from one day to the next.

一天又一天我不知道该期待什么。《牛津词典》

5·Military historians may never know what brought down the jet.

军事史学家们也许永远不会知道是什么击落了那架喷气式飞机。《柯林斯英汉双解大词典》

6·You never know what to expect with her. She's so temperamental.

你永远说不清她要干什么。她一时一变。《牛津词典》

7·Keep your eye on these jokers, you never know what they will come up with.

盯住这些家伙，你永远不知道他们会想出什么来。《柯林斯英汉双解大词典》

8·She thought constantly about her family; she might never know what had become of them.

她经常想着她的家人；她也许永远都不知道他们怎么样了。《柯林斯英汉双解大词典》

9·You never know where you stand with her—one minute she's friendly, the next she'll hardly speak to you.

你从来拿不准你和她的关系如何—她一会儿跟你亲热，一会儿连话也不大跟你说。《牛津词典》

10·I'm leaving for Shanghai and then I'll never know how it turns out.

我要去上海，然后我就永远不知道结果如何了。