Question

Don't forget ()the door ,when you leave the room

Answer 1

Don't
forget
()the
door
,when
you
leave
the
room
答案：to
close
翻译：当你离开房间的时候，不要忘记（去）关门。
注意：forget
to
do
忘记要去做某事.
(未做)

forget
doing
忘记做过某事.
(已做)

Answer 2

forget
doing意思是忘记曾经做过的某事,比如你原来说了什么话,你忘了
forget
to
do
是忘记做某事,但是还没有做