Formal:
* 对不起 (duì bù qǐ): This is the most common and versatile way to say "I am sorry". It is polite and appropriate for most situations.
* 抱歉 (bào qiàn): This is slightly more formal than "对不起" and can be used in situations where you need to express a deeper apology.
* 十分抱歉 (shí fēn bào qiàn): This is a more emphatic way of saying "I am very sorry".
Informal:
* 不好意思 (bù hǎo yì si): This is a more casual way to say "sorry" and is often used for minor offenses.
* 抱歉 (bào qiàn): This can also be used informally, but it's slightly more serious than "不好意思".
Other Expressions:
* 是我的错 (shì wǒ de cuò): This literally means "it's my fault" and is a more direct way of taking responsibility for your actions.
* 请原谅 (qǐng yuán liàng): This literally means "please forgive me" and is a more formal and respectful way to apologize.
Choosing the Right Expression:
The best way to choose the right expression is to consider the context of the situation. If you are apologizing for a serious offense, it is best to use a more formal expression like "对不起" or "抱歉". If you are apologizing for a minor offense, you can use a more informal expression like "不好意思".
It's also important to remember that in Chinese culture, it's considered important to show sincerity and humility when apologizing. You can do this by using body language such as bowing your head or looking down, and by speaking in a quiet and respectful tone.