8.3 remember doing/to do

8.3 remember doing/to do
       
　remember to do 记得去做某事　　　　 (未做)
　remember doing　记得做过某事　　　 (已做)

Remember to go to the post office after school.
记着放学后去趟邮局。
Don't you remember seeing the man before?
你不记得以前见过那个人吗?