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1. known for sure, something that has been established beyond doubt .
eg, it's certain that more changes are coming.
i wasn't sure they are gonna visit this year, but it sounds like it's a certain.
don't prounce t . such as Manhattan
2. confident to have complete conviction, where you saying about yourself . I'm certain...
prounce t to emphasized your surty.
I'm sure is more causal than I'm certain
eg, I'm certain you will like this movie.
are you absolutely certain that your numbers are correct ? ( at work feels like more formal)
are you certain about that ?
3. being specific but not explicitly明确地 named or stated, to avoid giving specific for some reason.
eg, he raises the certain concerns while we are chating, so i decided not to go on the second day.
there's a certain things that we should discuss now.( you're going to discuss them but here at this moment when i tell you we need to discuss them, no one is discuss them yet.)
4. to pointing out something that i know, and I'm not naming you to be silly. you referring someone without naming them, to tease someone .
eg, it looks like a ceratin someone got a haircut, i love it . (i know you got a haircut)
a certain someone is coming over for dinner tonight, so everyone be on their best behaviour .
5. a certain ... 法语, something usually at a appealing quality吸引人的品质but you can't really describe in words, it's difficult to express. ( positive)
eg, the actor has a certain...
hello are you surprised a certain someone is on time ? (说这句话的人经常迟到但这次准时到了)
i was certain you're gonna be late.
i know, it's usually certain that i will be ten minutes late.
i love this scarf 围巾that you're wearing, it's kind of giving you a certain ...(法语) 难以形容的气质/品质
well, I'm grad to hear.
there are certain things we need to discuss that i am ... of it.