如果我们当时没跑起来，可能就错过那班火车了。

We ___could ___have missed the train if we hadn't run.

到明天这个时候，她可能已经把报告写完了。

By tomorrow, she ___could ___have finished the report.

警方表示，这场事故可能是由路面结冰引起的。

The police said the accident ___could ___have been caused by ice on the road.