before后是加动名词吗

efore后面有3种情况
1、接句子,如：
He had got home before I called up him.
2、接动名词,前提是主句和从句的主语必须一致,before后面的主语可省略,如：He has worked for a company before graduating from university.
3、接名词,上面第2种情况还可以这样写：
He has worked for a company before graduation.