It is actually relatively easy if you follow a few principles. *None of my parents(like/likes) to drink coffee. ( This is bad English. Use "neither" ) => Neither of my parents likes ... ("neither" means "not one not the other", so singular) => "none" can be either singular or plural, by the way. *Some of my neighbors (has/have) a pet. => Some of my neighbors have... ("some" associated with a plural [neighbors] is plural) *A few of my classmates(think/thinks) animals are intelligent. => A few of my classmates think... ("a few" is always plural) *One of my friends (own/owns) a car. => One of my friends owns a car ("one" is always singular) *Each of my co-workers(use/uses) a computer. => Each of my co-workers uses ("each" and "every" are always singular) *Most of the scientists in the TV show (work/works) with animals. => Most of the scientists in the TV show work... ("most" associated with a plural is plural)