这把刀是用来切菜的，不是用来开瓶子的。

zhè bǎ dāo shì yòng lái qiē cài de, bú shì yòng lái kāi píngzi de.

This knife is for cutting vegetables, not for opening bottles.

这笔钱是用来交房租的，不能随便花。

zhè bǐ qián shì yòng lái jiāo fángzū de, bù néng suíbiàn huā.

This money is for paying rent and can't be spent carelessly.

这个软件是用来编辑视频的，操作很简单。

zhè gè ruǎnjiàn shì yòng lái biānjí shìpín de, cāozuò hěn jiǎndān.

This software is for editing videos, and it's very easy to use.