Maria Diaz’s Reviews > The Grouchy Grammarian: A How-Not-To Guide to the 47 Most Common Mistakes in English Made by Journalists, Broadcasters, and Others Who Should Know Better > Status Update

The subject and the predicate in the sentence must agree. Both must be singular or both must be plural.

Think about what you are saying! :P

a book about this grouchy grammarian that complains about other people's grammar? *.* I must be in heaven. Anyways, I will need this to avoid grammar mistakes and of course to be a better reviewer of YA books. I'm coming for you!