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The Blue Book of Grammar and Punctuation

Grammar Rules

Being determined to learn and use good grammar shows that we care about thinking and communicating with logic and clarity. It also helps us develop greater fluency in expressing our thoughts and ideas. Whether we are writing a letter or applying for professional work, good grammar stands out, and people notice it.

Our grammar rules and guidelines answer your questions about correct usage in American English. Select your topic to learn more about proper grammar for precise communication.

Grammar Rules

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Note: Some grammar usage rules vary among authorities. For example, the Associated Press (AP) Stylebook is a guide specific for news media and journalists while The Chicago Manual of Style (CMS) is used by many book publishers and writers. The Blue Book of Grammar and Punctuation leans towards usage rules in CMS along with other authoritative texts and does not attempt to conform to the AP Stylebook, which differs significantly in some aspects.