How to Speak and Write Correctly

In order to speak and write the English language correctly, it is imperative that the fundamental principles of the Grammar be mastered, for no matter how much we may read of the best authors, no matter how much we may associate with and imitate the best speakers, if we do not know the underlying principles of the correct formation of sentences and the relation of words to one another, we will be to a great extent like the parrot, that merely repeats what it hears without understanding the import of what is said.