certain イディオム

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dead certain

very certain, very sure, positive He's dead certain that Ming is the man who talked to him.

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for certain

without doubt, certainly, surely It is for certain that he will not be playing in the game tonight.

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in no uncertain terms

definitely, clearly, call a spade a spade They told us about sex and drugs in no uncertain terms.

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certain of

sure of 确信；自信
He is certain of winning the game．他确信会赢得这场比赛。
He felt quite certain of success．他对成功胸有成竹。

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for a certainty certain

for sure；without doubt确定地；无疑地
Iknow it for a certainty that he'll get a promotion．我的确知道他将被提升。
I know for a certainty that he came from Shanghai．我确实知道他来自上海。
He left town a week ago， I know this for a certainty．他一星期前离开了这个城市，这一点我确实知道。
Do you know it for certain？你对这件事肯定知道吗？
I could not say for certain that he was wrong．我不能断然地说他错了。
I know for certain that he has come．我确实知道他来了。

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for a certainty/for certain

for sure；without doubt确定地；无疑地
Iknow it for a certainty that he'll get a promotion．我的确知道他将被提升。
I know for a certainty that he came from Shanghai．我确实知道他来自上海。
He left town a week ago， I know this for a certainty．他一星期前离开了这个城市，这一点我确实知道。
Do you know it for certain？你对这件事肯定知道吗？
I could not say for certain that he was wrong．我不能断然地说他错了。
I know for certain that he has come．我确实知道他来了。

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for a for certain

for sure；without doubt确定地；无疑地
Iknow it for a certainty that he'll get a promotion．我的确知道他将被提升。
I know for a certainty that he came from Shanghai．我确实知道他来自上海。
He left town a week ago， I know this for a certainty．他一星期前离开了这个城市，这一点我确实知道。
Do you know it for certain？你对这件事肯定知道吗？
I could not say for certain that he was wrong．我不能断然地说他错了。
I know for certain that he has come．我确实知道他来了。

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make certain

make sure（of）弄清楚；确定
Make certain where we are going．弄清楚我们去哪儿。
Have you made certain of the time of the train？火车的时间你已弄清楚了吗？

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make certain (of)

make sure（of）弄清楚；确定
Make certain where we are going．弄清楚我们去哪儿。
Have you made certain of the time of the train？火车的时间你已弄清楚了吗？

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to a certain extent

somewhat在某种程度上
You are right to a certain extent．在某种程度上你是对的。

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for certain|certain|for|for sure|sure

adv. phr. 1. Without doubt; certainly; surely. He couldn't tell for sure from a distance whether it was George or Tom. He didn't know for certain which bus to take. I know for certain that he has a car. 2. slang Certain. "That car is smashed so badly it's no good any more." "That's for sure!"
Compare: SURE THING.

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certain

certain
see for certain.

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certainty

certainty
of a certainty
Archaic without a doubt; certainly

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death and taxes, certain as

death and taxes, certain as
Also, sure as death and taxes. Bound to occur, inevitable, as in His business is going to fail, certain as death and taxes. This phrase was invented by Benjamin Franklin in a letter (1789) and has been repeated ever since, the government's recurring need for revenue probably assuring its continued popularity.

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uncertain

uncertain
see in no uncertain terms.