Plural/ˈplʊrəl/ Definition 1 of 2Pro Tip 1/3Regular Forms Most plurals add 's' or 'es'. Learn the pattern to easily form them. One apple becomes two apples. Pro Tip 2/3Irregular Varieties Memorize irregular plural forms; they don't follow the usual rules. The plural of 'child' is 'children'. Pro Tip 3/3Unchanging Words Some words have the same singular and plural form, such as 'sheep'. One sheep, two sheep.