English plurals can be simple—just add “-s” or “-es”—but irregular forms like “child” to “children” or “mouse” to “mice” often trip up learners. Mastering these patterns, along with avoiding common ...

English is full of irregular plural forms based on Latin and Greek. They can be confusing (apparatus? apparati? apparatuses?). They can be fun (the brothers Winklevii! and the flying Elvii! all ...