make certain

phr

• ① 弄清楚,弄确实<of>;弄清楚以便有把握(做到某事)<that>
  • I think there's a train at 8, but you'd better make certain.我想八点有一班火车,不过你最好确定一下。
  • I'll go earlier and make certain of getting there on time.我会早一点去,以确定准时到达那里。
  • Make certain (that) you know what time the train leaves.你要确实知道火车什么时候开。