知识点二makesure弄明白;设法确保makesure+that从句意为“务必做到”；makesure+of/aboutsth.意为“对确信”2.(翻译)当你离开房间时一定要关好门。thedoorisclosedwhenyouleavetheroom.

知识点二make sure弄明白;设法确保

make sure+that 从句意为“务必做到” ；make sure+of/about sth.意为“对 确信”

2.  (翻译) 当你离开房间时一定要关好门。

the door is closed when you leave the room.