It is remarkable that words of the English language are so many, but their many uses are so few. All the words in the English language are arranged within eight classes called Parts of Speech.
This simple arrangement makes English grammar possible. To be good writers and grammarians, we do not need to know what to do with 400,000-600,000 English wordswe only need to know what to do with eight classes of words! When we
know all about a noun, pronoun, adjective, verb, adverb, preposition, conjunction, and interjection, we know all about grammar!