Almost all the English learners have a misunderstanding that you must study grammar rules in the beginning,when you learn English.When you speak,you do not have a lot of time to think about those grammar rules.You have to answer immediately for others questions while speaking.But when you study grammar rules initially,then you think about those grammar rules before you speak and probably you speak much slower and you understand much slower.It is not so important for you to study the grammar rules in the beginning for speaking.For writing it is different.How do native speakers learn grammar? Have you ever strained your brain to think about this ???? Well, they learn grammar through listening, listening to correct grammar,again and again.When you listen to this grammar repeatedly,it gets stored deeply in your brain.Then,when it is time for you to speak,you will be able to use this grammar because you will know what correct English grammar sounds like !!