睡觉前别忘了关上窗户。

Shuìjiào qián bié wàng le guānshang chuānghu.

Don’t forget to close the window before sleeping.

外面太吵了，把门关上吧。

Wàimian tài chǎo le, bǎ mén guānshang ba.

It’s too noisy outside; close the door.

请关上门。

Qǐng guānshàng mén.

Please close the door.