I'm not sure you're 我不确定
But I'm not sure you're correct about that.
但我不能肯定你说的是对的。
I'm not sure you're right about the result of the coming contest.
我不能肯定你对即将到来的比赛的结果的预测是正确的。
But I'm not sure you're correct about that. I heard he's been transfered to another company as a marketing manager.
但我不能肯定你说的是对的,我听说他被转到别的公司做销售经理。
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