First, the good news. If
you’re a native speaker of English, you already know English grammar. Every
native speaker of English over the age of two or three (at least those without
some sort of developmental issue) knows English grammar by the time they reach
the age of two or three years old, though they may still be refining certain
points well into their fourth year. If you didn’t know English grammar, you
would not be able to construct, or understand, an English sentence. Which,
obviously, you can – you’re reading this, aren’t you?