Download KEY WORDS FOR FLUENCY books
The aim of this three book series is to work on collocations so as to improve vocabulary, necessary to achieve fluency in all four skills: speaking, listening, reading and writing. The books are addressed to learners and definitely not for class use but, rather, for self-study, thanks to a very simple structure and answer keys.
According to the author, key words are “the most common and useful words in English” and thus “the most important” to learn, all the more so as “they combine with lots of other words in short expressions”.
The books are provided into three levels pre-intermediate, intermediate, upper-intermediate.