- Sorry对不起(duì bu qǐ): A more serious and formal apology, used when you have truly done something wrong, caused trouble, or hurt someone. - Excuse me / Sorry不好意思(bù hǎo yì si): A milder, more polite expression, mostly used for small interruptions or minor mistakes. - 对不起（duì bu qǐ）deeply sorry - 不好意思（bù hǎo yì si）lightly sorry