After having taken off,the plane flew low over the city.帮我分析一下前面那_英语解答

After having taken off,the plane flew low over the city.帮我分析一下前面那句的时态好么?是什么时态?为什么要这样用?

人气：216 ℃　时间：2020-05-10 21:29:48

解答

真正的主语是plane,the plane 先是 take off （飞机降落）,然后再是flew low over the city.
飞机降落已完成动作,所以用完成时,因为after是介词,后接名词,所以have 变成名词形式：having.