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1·I'm not sure I can walk so far.

我没有把握能步行这么远。《牛津词典》

2·I'm not sure, Liz said vaguely.

“我不能肯定，” 莉兹含糊地说。《柯林斯英汉双解大词典》

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

我说不准星期五是否能成行。《牛津词典》

4·I'm not sure, honest.

我不能肯定，不骗你。《柯林斯英汉双解大词典》

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

我不确定我会不会再相信人。《柯林斯英汉双解大词典》

6·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。《牛津词典》

7·'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。《牛津词典》

8·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。《柯林斯英汉双解大词典》

9·I am not sure whether this was courage or pigheadedness.

我不确定这是勇气还是顽固。《柯林斯英汉双解大词典》

10·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。《牛津词典》