This document discusses common problems with subject-verb agreement and provides guidance rules. It notes that the verb must agree with the subject in number - singular verbs for singular subjects and plural verbs for plural subjects. Some key challenges covered include: - Verbs must agree with the subject even if a prepositional phrase separates them - Expressions of quantity like "all" or "some" can be singular or plural depending on what follows the preposition - With inverted subjects and verbs, the verb must still agree with the actual subject based on its position and type - Certain singular words like "everyone" or "everything" take singular verbs despite plural meanings