核心问题
可以说 make sure that,能否说 make certain that 呢?
词典解答
既可以说 make sure that, 也可以说 make certain that。请看下面的实例：
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Please make sure/certain that you enclose your birth certificate. (CGEL) 请一定把你的出生证明装入信里。
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Make certain (that) you know what time the train goes. (LDCE) 要弄清火车出发的准确时间。
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Can you draw Harry a map just to make certain he'll find the hotel? (LDCE) 你能否给哈里画张地图以确保他能找到那家旅馆？
(参见 make certain, make sure)