您要查找的是不是：
- I can't say for certain when he will arrive. 我说不准他什么时候会来。
- I can't say for certain what to do. 我说不准该做什么。
- I couldn't say for certain when he'll arrive. 我说不准他什麽时候到。
- For certain reasons I will be unable to attend the meeting. 因为某种原因，我不能出席这次会议。
- It's a good idea, so try to get a hearing for it. 这是个好主意，要想办法加以申述。
- I can not say for certain what to do. 我说不准该做什么。
- I can't say for certain off-hand. 我还不能马上说定。
- Gain recognition; gain a hearing for the proposal. 得到赏识; 这个建议羸得了普遍的赞赏
- Do you know for certain what will happen to him ? 你肯定他会碰到什么事吗?
- We never knew for certain how it happened. 究竟是怎么发生的，我们始终未搞清楚。
- Nobody knows for certain what kind of man he is -- he's rather a lone wolf. 谁也不知道他是什么样的一个人--他总爱独来独往。
- Look at that sky! It's going to rain for certain. 瞧那天空！肯定要下雨了。
- I can not say for certain when he will arrive. 我说不准他什么时候会来。
- He may succeed,but I don't know for certain. 他也许能成功，但我不敢肯定。
- We don't know for certain when it happened. 我们不能肯定是在什么时候发生的。
- We may succeed,but I can't know for certain. 我们可能成功，但我不敢说肯定成功。
- Harris says: "We can't say for certain. 哈里斯说：“我们说不准。
- It's a good idea,so try to get a hearing for it. 这是个好主意，要想办法加以申述。
- I can't say for certain when we'll arrive. 我说不准我们什么时候能到。
- This is the best news I've heard for a long time! 我很久都没听到这么好的消息了！
