4 sentences

1. 昨天是谁把窗子打破的？

   zuó​tiān shì shéi bǎ chuāng​zi dǎ​pò de?

   Who was it that broke the window yesterday?

   Source: Tatoeba

2. 窗子是你打开的吗？

   chuāng​zi shì nǐ dǎ​kāi de ma?

   Did you open the window?

   Source: OpenSubtitles

3. 她把房间里的窗子全都关上了。

   tā bǎ fáng​jiān lǐ de chuāng​zi quán dōu guān​shàng le.

   She closed all the windows in the room.

   Source: Tatoeba

4. 他透过窗子向外看，发现街道上一个人也没有。

   tā tòu​guò chuāng​zi xiàng wài kàn, fā​xiàn jiē​dào shàng yī gè rén yě méi​yǒu.

   He looked out the window and found that there was no one on the street.

   Source: Dong Chinese Dictionary