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.