Words for Students of English, Vol. 4: A Vocabulary Series for ESL Volume 4

I own all six of the books in this series and find them to be extremely useful and effective. My students ask for these lessons. The books range from Beginner, Book 1 to Advanced, Book 6. I like the fact that at the beginning of each unit there is a word chart that gives all the forms of each base word studied. For instance,if the word, "effect" is being studied, "effective", "effectively", and "effectiveness" are also included. Each word is defined and an example given, and followed with exercises. I often assign these lessons as pair work.