can't help 什么意思后面跟to do 还是doing

can't help doing 是"忍不住..."的意思,can't help crying忍不住哭起来
can't help to do 是"帮忙去某事"的意思, 如:
i can't help to fix the door. 修门的事我帮不上忙.

can't help to do 表示“不能帮助做谋事”
can't help donging表示“情不自禁的干谋事”

doing
表情不自禁之意

doing
to do 多俗啊