1.I can't say for certain.(我说不准)
2.I can't say for certain what to do.(我说不准该做什么)
3.I couldn't say for certain when he'll arrive.(我说不准他什麽时候到)
4.I can not work out how much time it'll take me.(我说不准这要花多少时间)
5.What will happen is anybody's guess!
(要发生什麽事, 谁也说不准!)
6.`Is that true?' `Maybe, I'm not sure.'(‘是真的吗?’‘可能, 我说不准.’)
7.It may rain or it may not. It's hard to tell.
(天也许下雨, 也许不下. 说不准)
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