Formal:
* Je ne parle pas anglais. (This is the most direct and formal way to say it.)
Informal:
* Je parle pas anglais. (This is more casual and you would use it with friends or people you know well.)
* Je comprends pas l'anglais. (This means "I don't understand English" and is a bit more informal.)
* J'ai pas l'anglais. (This is a very informal way to say it, literally meaning "I don't have English." It's not grammatically correct but it's common in everyday speech.)
You can also add a phrase to explain the situation:
* Je ne parle pas anglais, mais je peux essayer. (I don't speak English, but I can try.)
* Je parle un peu anglais. (I speak a little English.)
* Je suis en train d'apprendre l'anglais. (I am learning English.)
Remember to use the appropriate level of formality for the situation.