University of Toronto (Canada)
University of Toronto: Subject Verb Agreement
Site provides some different rules applying to subject-verb agreement, especially in cases of "expressions of quantity." Excellent information for students looking to hone their craft of writing.
University of Calgary
University of Calgary: Subject Verb Agreement
This site begins with a general rule on subject-verb agreement, then gives three different examples of understanding the subject-verb agreement. The site also discusses rules for verb agreement with definite and indefinite pronoun...