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- We are not sure yet whether we'll go or not. 去不去， 我們還不能肯定。
- I am sorry,but I am not sure when she'll be back. 對不起，我不知道她什麼時候回來。
- I am sorry, but I am not sure when she'll be back. 對不起，我不知道她什麼時候回來。
- I am not sure if that will be necessary. 也許沒有必要吧。
- I am not sure all of us will be able to attend. 我不確定我們能全體出席。
- I am not sure you are correct about that. 我不能肯定你在這件事上是對的。
- I am not sure when he is leaving. 我不能肯定他什麼時候走。
- I think he will agree, but I am not sure. 我想他會同意，但我沒有把握。
- We are not sure yet. Probably in St.Albans. 還說不準兒，也許是在聖奧爾本教堂舉行。
- He is either a clerk or a worker. I am not sure. 他不是職員便是工人。我不大清楚。
- I am not sure I agree with you. It is not too bad. 我不敢說同意你的意見。這部電影並不太糟。
- I am not sure how to compile a dictionary. 恐怕我不會編詞典。
- I am not sure just when he will come. 我不敢說他究竟什麼時候來。
- I am not sure what time you can reach him. 我吃不准你什麼時候可以打電話找到他。
- I am not sure whether I am going to leave. 我不知道我是不是要離開。
- I am not sure if he has a clean slate. 我不知道他的歷史是不是清白的。
- Fight no battle you are not sure of winning. 不打無把握之仗。
- I am not sure,but I'll try my best. 我沒把握，不過我將儘力而為。
- I was not sure you were correct about that. 我不能肯定你在這件事上是對的。
- I am not sure whether I have locked the door. 我沒把握是否鎖了門。
