We all know the names of the four skills in English language, but today I learned to many things about the subskills and the way we use them commonly all the time. I can notice that there´s no way to give priority to one of them, and also there are going to be times, that to explain one skill you have to refer to another one. It´s like successive approximations. The most important thing is that you have to encourage students to practice each skill in every moment, and I think this is the only way to learn and get to properly use the English as a second language.