21:  For any Englishman，there can never be any discussion as to who is the world's greatest writer. Only one name can possibly suggest itself to him：that of William Shakespeare. Every Englishman has some knowledge of his work. All of us use words and phrases from Shakespeare's writings that have become a part of the English-speaking people. Shakespeare, more perhaps than any other writer, made full use of the English language. Most of us use about five thousand words in our normal employment of English; Shakespeare in his works used about twenty-five thousand！ There is probably no better way for a foreigner (or an Englishman!) to appreciate the richness and variety of the English language than by studying the various ways in which Shakespeare uses it. Such a study is well worth the effort (it is not, of course, recommended to beginners), even though some aspects of English usage, and the meaning of many words, have changed since Shakespeare's day.