可以

You can use it as a full sentence or inside a bigger one. To ask a question, just add 吗 (ma) at the end. For example, 我可以进来吗? (May I come in?). To answer, just say 可以 for 'yes' or 不可以 for 'no.' It is very straightforward. You put it right before the action verb you are talking about. It feels natural and flows well in almost any sentence structure.

Use it when you are at a restaurant and need to ask for the bill. Use it when you are texting a friend to see if they are free to hang out. It is perfect for professional meetings when you want to suggest an idea. If you are at a shop and want to try on a shirt, 可以 is your best friend. It sounds polite but not overly stiff. It is the ultimate 'green light' word in Chinese culture.

Don't use 可以 if you are talking about a skill you learned, like speaking a language. For that, use 会 (huì). If you say 我可以写汉字, it sounds like you are asking for permission to write them, not saying you know how. Also, avoid using 不可以 too harshly with elders or bosses. It can sound a bit like a parent scolding a child. In those cases, a softer 'not very convenient' is better.

In Chinese culture, being agreeable is often valued. 可以 is a very 'safe' word because it is positive and cooperative. Interestingly, in modern slang, people sometimes repeat it like 可以可以 to show they are really impressed or totally on board. It has moved from a simple word of permission to a way of showing enthusiastic social support. It’s the verbal equivalent of a thumbs-up emoji.

You will often hear 行 (xíng), which is a bit more casual and common in Northern China. There is also 能 (néng), which focuses more on your physical capability or time availability. If you want to sound extra cool, you can say 没问题 (méi wèntí), which means 'no problem.' But if you are just starting out, sticking with 可以 will never lead you astray.