then she swam to the shore after spending the whole night in the water 为什么spend 加ing
问题描述：
then she swam to the shore after spending the whole night in the water 为什么spend 加ing
答
then she swam to the shore after spending the whole night in the water=
then she swam to the shore after she spent the whole night in the water
这个状语从句有两个相同的主语，不美观，于是从从句里省略一个主语
省略的方法是，after 介词后跟动名词形式
如果是after she had spent the whole night in the water,就变成动名词的完成式：having done
after having spent
答
after 是介词。。。
答
after是介词
介词后不能直接接动词,只能接动词+ing,构成动名词,