Ever wondered how a particular language functions? Well, this book is the one to use! It includes grammatical sketches of languages with sizeable amounts of native speakers. Each section generally contains the some of the following about a language: brief historical background, phonology, morphology, syntax, and if it's not written in Roman letters, a chart for that particular alphabet/syllabary. One of the things I particular liked was giving word-for-word translations then giving a free one. This gives me an idea on how languages like German, Japanese, Tagalog, Vietnamese, etc. form their sentences (like SVO, VSO, SOV). And also for some languages, like Polish and Spanish, it lists the allophones for a phoneme. A word of advice, I highly recommend having at least some knowledge in linguistic terminology and in IPA (International Phonetic Alphabet), since this book uses them extensively. This is one reference work that you should definitely have.