3 sentences

1. 不，我以前从没去过后台。

   bù, wǒ yǐ​qián cóng​méi qù guo hòu​tái.

   No, I've never been backstage before.

   Source: AI Challenger 2017

2. 你本可以邀请我去后台。

   nǐ běn kě​yǐ yāo​qǐng wǒ qù hòu​tái.

   You could have invited me backstage.

   Source: OpenSubtitles

3. 我跟你在后台见。

   wǒ gēn nǐ zài hòu​tái jiàn.

   I'll see you backstage.

   Source: OpenSubtitles