1.she heard front door open and heavy foot steps in the hall
问题描述：
1.she heard front door open and heavy foot steps in the hall
可否改为she heard front door opening and heavy foot steps in the hall
2.he told me that he could not go to sleep one night because he heard a strange noise coming from the bar
可否改为heard a strange noise come from the bar
答
首先,hear sb do sth 和 hear sb doing sth 汉语意思不同,hear sb do sth 表示听到某人做过某事,这里只强调曾经听到过而已；而 hear sb doing sth 则表示听到某人正在做某事,所以不能改为你的那种做法.