Don’t forget locking the door before you leave.［改错］

Don’t forget locking the door before you leave.［改错］
Don’t forget locking the door before you leave.［改错］

Don’t forget locking the door before you leave.［改错］
Don’t forget to lock the door before you leave.
forget doing 忘记做了.
forget to do 忘记去做.

Don’t forget to lock the door before you leave.

Don't forget to lock the door before you leave.
forget to do sth.忘记要做某事（还没有做）
forget doing sth.忘记做了某事（暗示已经做了）