Certain

肯定他会同意[他一定同意].

对那事我完全可以肯定。

任何替代肯定会稍逊一筹的。

确定事物正确性的一种检查。

sure和certain的用法常常是相同的

【记】※ curtain-窗帘,certain-确定的:窗帘安在确定的位置上 ※ ce-拼音“厕”,r-似“花”,tain-拼音“太难”:厕所里养花确实太难了 ※ c-似“月亮”,er-拼音“儿”,ta-拼音“塔”,in-在…里:月儿在塔里是一定的

certain adj 1 [pred 作表语] ~ (that...); ~ (to do sth) sure beyond doubt; that can be relied on 无疑; 确定 It is certain that he will agree/He is certain to agree. 肯定他会同意[他一定同意]. One thing is certain: I'm not coming here again. 有一件事可以肯定, 我再也不来了. 2 [pred 作表语] ~ (that...); ~ (of/about sth) positive in one's mind; completely sure 确信; 肯定 I'm certain (that) she saw me. 我肯定她看见我了. She saw me: I'm certain of that. 她看见我了, 这一点我可以肯定. I'm not certain (of) what she wants. 我不清楚她想要什麽. 3 [attrib 作定语] sure to come, happen or be effective; assured 一定会来到、 发生或生效的; 有把握的 There is no certain cure for this disease. 这种病没有特效药. They face certain death unless they can be rescued today. 他们除非今天获救, 否则必死无疑. 4 [attrib 作定语] specific but not named or stated 某（不指明的或不说出的） 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. The terrorists will only release their hostages on certain conditions. 恐怖分子只有在某些条件下才释放人质. 5 [attrib 作定语] named but not known 说出姓名但不认识的 A certain Mr Brown telephoned while you were out. 你出去的时候, 有个叫布朗的先生来过电话. 6 [attrib 作定语] slight; some 稍微的; 一些的; 一点儿的 There was a certain coldness in her attitude towards me. 她对我的态度有点儿冷淡. I felt a certain reluctance to tell her the news. 我不太愿意告诉她这个消息. 7 (idm 习语) for `certain without doubt 无疑地; 确定地 I couldn't say for certain when he'll arrive. 我说不准他什麽时候到. I don't yet know for certain. 我知道得不确切. make certain (that...) inquire in order to be sure about sth 弄清楚; 弄明白; 弄确实 I think there's a train at 8.20 but you ought to make certain. 我想8点20分有一班火车, 不过你应该打听清楚. make certain of sth/of doing sth do sth in order to be sure of (doing) sth else 采取行动以便确有把握做其他事 You'd better leave now if you want to make certain of getting there on time. 你要想准时到达那里就最好马上走. certain, pron ~ of... some particular members of (a group of people or things) （人或物中的）某些 Certain of those present had had too much to drink. 有些出席的人喝得太多了. certain, NOTE ON USAGE 用法 Sure and certain are often used in the same way *sure和certain的用法常常是相同的 They're sure/certain to be late. 他们一定迟到. I'm sure/certain (that) they'll be late. 我肯定他们得迟到. One thing was sure/certain they'd be late. 有一件事是确定无疑的, 他们得迟到. They made sure/certain (that) they weren't late. 他们有把握不迟到. With `it' as an indefinite subject or object only certain can be used *it作不定主语或不定宾语时, 只可用certain与之连用 It was certain/ I thought it certain that they would be late. 肯定[我肯定]他们要迟到. Sure can sound weaker than certain, especially in conversation *sure的语气听起来比certain弱些, 特别是在对话中 I'm sure he'll manage it, ie I think/hope he will. 我确信他能办到（即我认为[希望]他能办到）.

*['sә:tәn]a. 确定的, 某一个的, 必然的【法】 确凿的, 无疑的, 可靠的相关词组: be certain of It is certain that I am certain that... I am not certain whether... to a certain extent for certain