我会说英语。

Drop this into a conversation whenever you need to switch languages. It usually comes right after a slightly panicked look from a local. You can add 一点儿 (a little) at the end if you are feeling modest. It is a complete sentence on its own. No fancy grammar is required here. Just say it clearly and watch the tension melt away.

Use it at the airport when checking in. Use it at a hotel if the paperwork looks confusing. It is perfect for business meetings when the translator takes a break. If a stranger approaches you for directions, this phrase sets the ground rules. It is also a great way to start a language exchange. You are offering a tool for connection.

Don't use it if you are trying to hide the fact that you understand what people are saying! Also, avoid using it in a way that sounds demanding. If you say it too loudly at a busy restaurant, it might sound like you are complaining. It is a statement of ability, not a command for others to stop speaking Chinese. Be careful not to use 能 instead of 会 here; 能 sounds more like physical capability.

In China, being able to speak English is highly respected. Many people study it for years but feel shy about speaking. When you say 我会说英语, you might actually encourage them to practice with you. There is a strong culture of modesty in China. Even if someone is fluent, they might say they only speak "a little." By being direct, you are being helpful and clear.

If you want to sound more natural, try 我会一点英语 (I speak a bit of English). If you want to ask if someone else speaks it, just add 吗 to get 你会说英语吗?. For a more formal vibe, you could say 我会讲英语. The word 讲 feels slightly more deliberate than 说. If you are texting, you might just use the English word "English" mixed with Chinese.