There are many ways to do that, you can go live abroad in England or the USA and you’ll learn it by listening and speaking with native speakers. If you don’t like travelling, you can take English courses in the country where you live. If you can’t afford to go to English classes you can watch English movies and that will help alot, because listening to native speakers and reading the translation helps memorising the words and the pronounciation. you can also read English books or stories or even a magazine.

the grammar is very important to learn English, so that you can speak properly. If you use one of these ways or any other way that you like and find more comfortable, you will learn how to speak, read and write in English in no time, Do you agree?