Sixteen sentences, each with a blank and a pair in brackets: read or reads, bake or bakes, visit or visits. My aunt bakes bread on Sundays but my cousins visit us every summer, a bus stops at the corner but the girls paint in the art room.
Sixteen items is more than most sheets in this set, and the length is doing work: the pairs are shuffled so singular and plural alternate unpredictably, and four items use I or we, which take the same form as a plural subject and undo any child who has decided the rule is simply that one thing gets an s. Grandpa fixes old clocks is the other one to watch, since fix takes -es rather than -s.