Formal:
* Marunong akong mag-Ingles. (This literally translates to "I know how to speak English.")
* Nag-aaral ako ng Ingles. (This means "I am learning English.")
Informal:
* Nag-i-Ingles ako. (This means "I speak English.")
* English ang alam ko. (This means "I know English.")
* Marunong ako mag-Ingles. (This is a more informal version of the first formal sentence.)
Note: The word "Ingles" (English) is pronounced "ING-gles" in Tagalog.
The best way to say it depends on the situation. If you are talking to someone in a formal setting, like a job interview, you should use the formal phrases. If you are talking to a friend or family member, you can use the informal phrases.