4000 Essential English words book

4000 essential English words is a six-book series that is designed to focus on practical high-frequency words to enhance the vocabulary of learners from high beginner to advanced levels. The series present a variety of words that cover a large percentage of the words that can be found in many spoken of written texts. Thus, after mastering these target words, learners will be able to fully understand vocabulary items when they encounter them in written and spoken form. Each unit present twenty words which are defined and used in sample sentences.