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- I'm not sure whether to resign or stay on. 我拿不准主意是辞职还是留任。
- I think this is their house but I'm not sure. 我想这是他们家，但不敢肯定。
- The thing of luminescence is not sure all gold. 发光的东西未必都是黄金。
- She is not sure of his answering her letter. 她无法确定他是否会回信给她。
- I'm not sure whether our team will win. 我不能肯定我队是否能赢。
- I'm not sure about the practicality of that suggestion. 我还无法确定那个建议的可行性。
- I'm not sure you're right about the result of the coming contest. 我不能肯定你对即将到来的比赛的结果的预测是正确的。
- I'm not sure if our book will be a success it's early days yet. 我们这本书是否受欢迎，我没有把握－－现在言之过早。
- Jean: I'm not sure, Billy. I feel dizzy and nauseated. 琴：我不确定，比利，我感觉昏眩作呕。
- I'm not sure that his business is strictly legitimate. 我说不好他的生意是否全部合法。
- I'm not sure whether to pass him or fail him; he's a borderline case. 我拿不定主意给他及格还是不及格，他处于两可的情况下。
- I'm not sure whether I have locked the door. 我没把握是否锁了门。
- I am not sure you are correct about that. 我不能肯定你在这件事上是对的。
- I'm not sure I know how to compile a dictionary. 恐怕我不会编词典。
- I'm not sure if it's safe to bathe in his pond. 我不敢肯定在这个池塘里洗澡是否安全。
- I am not sure when he is leaving. 我不能肯定他什么时候走。
- I think he will agree, but I am not sure. 我想他会同意，但我没有把握。
- We are not sure yet. Probably in St.Albans. 还说不准儿，也许是在圣奥尔本教堂举行。
- He is either a clerk or a worker. I am not sure. 他不是职员便是工人。我不大清楚。
- I am not sure I agree with you. It is not too bad. 我不敢说同意你的意见。这部电影并不太糟。
