He was able to run away before the war broke out.可否将 was able to 改为could为什么?
问题描述：
He was able to run away before the war broke out.可否将 was able to 改为could为什么?
答
不可以
could是有能力,指的是一种（过去）一直有的能力
was able to也是有能力,不过就必须有一定前提
句中的“ before the war broke out”决定只能用was able to