Mary usually brushes his teeth after (getting) up.为什么getting up要加ing形式?

问题描述:

Mary usually brushes his teeth after (getting) up.为什么getting up要加ing形式?

正确答案是:
这边after是介词
后面需要加ing形式~
这句话也可以这么写:
after he gets up~
不明白的再问哟,请及时采纳,多谢!