怪不得有蚊子，原来窗户打开了。

Guàibùdé yǒu wénzi, yuánlái chuānghu dǎkāi le.

No wonder there are mosquitoes, it turns out the window is open.

明天会有师傅来维修窗户。

Míngtiān huì yǒu shīfu lái wéixiū chuānghu.

A worker will come to repair the window tomorrow.

请把窗户关上。

Qǐng bǎ chuānghu guānshàng.

Please close the window.