Matthew’s Reviews > The Penguin Guide to Punctuation > Status Update

So far, this has been an entertaining, informative read. A punctuation mark contributes semantic structure to a sentence, but its precise operation depends on grammatical context. The book does a great job at systematically covering each operation and context. The author does present one noteworthy idiosyncrasy: He consistently lists "while" among the coordinating conjunctions. This is, at best, non-standard.