【How-to】How do you make a word ending in f plural

Summary. Regular plurals of nouns are formed by adding -s, -es, or -ies to the singular (e.g., girl s , virus es , dut ies ). Irregular plurals also often follow a pattern, originating sometimes in the parent language or rules of older forms of English (child ren , criter ia , oas es , g ee se, m ice , ind ices ).