你进来吧，请坐。

Nǐ jìnlai ba, qǐng zuò.

Come in, please sit down.

欢迎来我家，请坐，请喝茶。

Huānyíng lái wǒ jiā, qǐng zuò, qǐng hē chá.

Welcome to my home; please sit and have some tea.

大家请坐，我们开始上课。

Dàjiā qǐng zuò, wǒmen kāishǐ shàngkè.

Everyone, please sit; we will start class.