Hi everybody this is my first post

0Hi everybody I am studying for being an english teacher. I am from Chiapas a state in the south of mexico there are not english speakers here, only my teachers speak us in english but they are mexican, I have been learning english by listening to music and watching tv, but I still have many mistakes in grammar... for example I dont know when I have to put things like this.. in english you say the mary's house. the American Goverment or john's father... I dont know when I have to put that way.,. sometimes you use the english of the Americas, the House of Mary/... how to know what way is the right? why in english u say mary's house not the House of Mary... neither I dont know the difference between the usage of No and Not... plzzz give me some links for improving my grammar.. as well I would like to know are there some free softwares for speaking? I want to improve my pronunciation and to speak more clear... I hope your answer sorry if I have many questions but this forum it seems cool for me[A]050010id1