This is a really good book on grammar. It's full of information and is easy to understand. Therefore, everyone should read this. It even taught me a few things, and I'd considered myself to be well-versed in regards to grammar. Grammar snobs will occasionally be shocked as they thumb through this book. I didn't know that people had such a hard time with such no-brainers as "guerrilla" vs "gorilla" and *gasp* "peak" vs "peek" vs "pique"! I'm embarrassed for anyone who learned something new whilst reading those chapters.