名詞で不規則複数の部類をご紹介しましょう。
a child children, a mouse mice, a tooth teeth, a foot feet, a goose geese, a woman women,
a man men, a child children, an ox oxen, a crisis crises, a phenomenon phenomena,
a bacterium bacteria, a stimulus stimuli (刺激) a criterion criteria (基準】a larva larvae (幼虫)
このくらい覚えておけば十分でしょう。😀👍