What kind of vocabulary and words learn in english? I am enjoying a lot learning english. I read and watch the most I can regarding this language: Newspapers, Youtube, whatsapp etc. and see a big difference between formal expressions and coloquial expressions;Then a doubt reaise: I must go by the formal or informal way? Many people says is better take the informal way because this represent a more realistic world. But I am not so sure; What if I have a important meeting related my job, and I started speaking with words that those executive men do not understand? I would feel so unconfortable!