After cleaning the floor,I went on to clean the window.为什么打扫要加ING呢

问题描述:

After cleaning the floor,I went on to clean the window.为什么打扫要加ING呢

after是介词,
介词后加动名词~
其实只要死记介词后用ING形式就好了~(大多数情况都是这样的~)