后接 that 从句。如:
Make certain you know what time the train leaves. 你要弄清楚火车开出的确切时间。
后接 of 短语。如:
You must make certain of the date of the meeting. 你必须把开会的日期弄清楚。
We went to the theatre early and made certain of getting seats. 我们去戏院很早,以便可弄到座位。
注:有时以上各结构可互相转换。如:
Make certain of his safe arrival. / Make certain that he arrived safe. 弄清楚他是否安全抵达了。
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