您要查找的是不是：
- to know sth for certain 确定某事
- It's too soon to know for certain. 现在还太早， 不知道确切情况 。
- I can't say for certain what to do. 我说不准该做什么。
- Do you know for certain what will happen to him ? 你肯定他会碰到什么事吗?
- She's not at all a proper person for you to know. 她可不是正派人，你不应该结识她。
- I want to know why Tom answers a letter for me. 我想知道为什么汤姆没有给我回信。
- For your information (ie This is sth you may wish to know), the library is on the first floor. 谨奉告，图书馆在二楼。
- He professed to know nothing about the matter. 他声称对此事一无所知。
- She's a dead ringer for a girl I used to know. 她酷似以前我认识的一个女孩。
- But for those who really want to know for certain can now make use of a simple cheek swab test to determine their dog's genotype. 如果黄色或巧色的拉拉生出黑色小狗，那黑色小狗一定携带有黄色或巧色的基因。
- would give the world to know sth.v. 为了知道某事愿付出一切代价
- I can't say for certain when he will arrive. 我说不准他什么时候会来。
- 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。
- would give the world to know sth 为了知道某事愿付出一切代价
- May I ask a favour of you (ie ask you to do sth for me)? 请您帮个忙行吗?
- Financial strength is the foundation of the policy, so you need to know how much funds are allocated for certain disability benefits and quote preferences. 财政实力是基础，政策，所以你需要知道有多少资金是分配给某些伤残抚恤金和引用的喜好。
- I can not say for certain what to do. 我说不准该做什么。
- And you come from North Dakota! I want to know. 原来你是北达科他州来的！真想不到！
- I couldn't say for certain when he'll arrive. 我说不准他什麽时候到。
- Kings used to know how to hold down the people. 国王们往往都知道怎样使人们服从他。
