I'm not sure I can walk so far.

我没有把握能步行这么远。

"I'm not sure," Liz said vaguely.

“我不能肯定，” 莉兹含糊地说。

I'm not sure if Friday's trip is a go.

我说不准星期五是否能成行。

I'm not sure, honest.

我不能肯定，不骗你。

I'm not sure I'll ever trust people again.

我不确定我会不会再相信人。

I'm not sure what I'll do when the chips are down.

我拿不准到了关键时刻我会干出些什么事来。

'I'm not sure I can make it tomorrow,' he said edgily.

“我不敢肯定明天能成功。”他紧张不安地说。

"Excuse me?" Kate said, not sure she'd heard correctly.

“能再说一遍吗？”凯特说道，不确信自己有没有听对。

I am not sure whether this was courage or pigheadedness.

我不确定这是勇气还是顽固。

We're not sure whether we still want to proceed with the sale.

我们不确定是否还要继续减价促销。

Confidentially, I am not sure that it wasn't above their heads.

私下里说，我不确定这没有超出他们的理解。

They had been invited to a Hindu wedding and were not sure what happened on such occasions.

有人邀请他们去参加一个印度教徒的婚礼，但他们不清楚这样的庆典会是怎样一种场面。

"I'm not sure," said Mrs. Brown.

“我不确定。”布朗夫人说。

I'm not sure that counts.

我不确定那算不算。

Mind you, I'm not sure I'd want one.

听着，我不确定我是否想要一个。

I'm not sure about it .

我对这不确定。

She is not sure.

她不确定。

'I'm not sure,' she responded.

“我不肯定。”她答道。

'I'm not sure,' she replied evasively.

“我不敢确定。”她躲躲闪闪地答道。

Um, I'm not sure how to ask you this...

嗯，我不知该怎么问你这个…

Ask me if you're not sure how to do it.

你要是拿不准怎么干，就问我。

'I'm not sure about it,' he said weakly.

“这我说不准。”他支吾说。

'I'm still not sure,' he said at length.

“我还是没把握。”他最后说道。

I'm not sure whether I should tell you this.

我拿不准该不该把这事告诉你。

I think this is their house, but I'm not sure.

我想这是他们家，但不敢肯定。

I'm not sure that I understand. Go over it again.

我不敢说我搞懂了。请再来一遍吧。

I'm not sure I'll be any good but I'll have a bash.

我不敢保证我能有什么用，但我会试试。

He was not sure whether he wished her to stay or go.

他说不准他到底是希望她留下还是离开。

I am not sure that this is sound democratic practice.

我不能肯定这就是正确的民主做法。

I'm not sure—I can find out for definite if you like.

我没把握—如果你愿意我可以去核实。