1.
Uh. I'm not sure if I agree.
呵，我不敢肯定。?
2.
I'm not sure. Can I take a massage?
我不敢肯定。我替你捎个口信，好吗？
3.
I think he lived in Shijiazhuang， but I can't say for sure.
我想他是住在石家庄，但是我不敢肯定。
4.
Her hair's very blonde, dyed, I think, but I'm not sure about that.
她的头发颜色浅黄，我觉得染过，但是我不敢肯定。
5.
I'm not sure if I can do it.
我不敢肯定我能做。
6.
That is something which we do not presume to state,it is something which we do not even believe
那是我们不敢肯定的，也是我们不敢相信的。
7.
I dare not affirm whether we can use so this word.
我不敢肯定我们是否能这样用这个词。
8.
I'm sure that the criminals won't pass the customs.
我敢肯定犯罪分子过不了海关。
9.
I think I've met him before, but I wouldn't swear to it, ie I'm not sure.
我好像见过他, 只是不敢肯定.
10.
I suspect that she is ill,but I'm not sure.
我猜想她病了，但不敢肯定。
11.
Her promotion was a fix, I'm sure.
我敢肯定她的提升有鬼.
12.
Yes. I'm positive. Look! Here's the bill.
对，我敢肯定。看！这是账单。
13.
I dare affirm that the tomato will be very expensive.
我敢肯定西红柿将很贵。
14.
I shall certainly be present at the meeting, but I am not sure about my wife.
我肯定会出席会议，但我的妻子是否出席，就不敢肯定了。
15.
Well, I didn't see her do it, but I'm pretty sure it was her.
嗯，我是没有亲眼看到，不过我敢肯定是她。
16.
I am sure there is a mistake in your calculations but I can't quite put my finger on it.
我敢肯定你计算有误，只是我不能明确指出错处。
17.
I'm sure Henry was none too pleased to hear the news, which must have come as a shock to him.
我敢说，亨利听到这个消息肯定不高兴，他肯定会大吃一惊。
18.
I am sure that he will pay back every cent the owes you.
我敢肯定，他会分文不差地把欠款还给你。