4000 Essential English Words is a six-book series that is designed to focuson practical high-frequency words to enhance the vocabulary of learnersfrom high beginning to advance levels. The series presents a variety ofwords that cover a large percentage of the words that can be found inmany spoken or written texts. Thus, after mastering these target words,learners will be able to fully understand vocabulary items when theyencounter them in written and spoken form. Each unit presents 20 words…
