妈妈买了新的床单来更换。

Māmā mǎile xīn de chuángdān lái gēnghuàn.

Mom bought new bed sheets for replacement.

我喜欢在夏天使用薄床单。

Wǒ xǐhuān zài xiàtiān shǐyòng báo chuángdān.

I like to use thin bed sheets in the summer.

她每周都会更换床单。

Tā měi zhōu dūhuì gēnghuàn chuángdān.

She changes the bed sheets every week.