And many others haven’t either!  Many confuse them with adjectives, but their roles in sentences are very different, and it’s crucial to know and understand these words.  That is why this book is very important.  The Determiners are determined to show you how important they really are!  Besides, you can take adjectives out of most sentences – and the sentences still make sense – but, you cannot remove determiners.  I think this makes them very important.