礼貌用语 (lǐmào yòngyǔ) - Polite expressions: Use 对不起 for sorry, 没关系 for it's okay, 谢谢 for thank you, 不客气 for you're welcome.

请 + verb (qǐng + verb) - Please do something: 请坐 (qǐng zuò) - Please sit down; 请进 (qǐng jìn) - Please come in.

别 + verb (bié + verb) - Don't do something: 别走 (bié zǒu) - Don't go; 别说话 (bié shuōhuà) - Don't speak.

💡 Practice saying 对不起 and 没关系 together in a short conversation.

💡 Remember that 请 is always placed before a verb to make a polite request.

💡 Use 别 to tell someone not to do something; it's a simple and useful pattern.