An imperative sentence used to express a request or a suggestion is frequently followed by a tag question such as 怎么样? or 好不好?
Nǐ qù yóu jú bāng wǒ jì fēng xìn ，hǎo bú hǎo ？
Go to the post office and mail a letter for me, OK?
Wǎn shàng nǐ yǒu kōng ma ？Yī qǐ qù kàn chǎng diàn yǐng ，zěn me yàng ？
Are you free this evening? Let’s go to a movie together, how’s that?
 Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.