my—our,you-you,he-they,him-them,his-their(theirs),she-they,her-their,hers-theirs,its-theirs,knife(你的问题中的knife拼错了哦~)-knives,wife-wives,fly-flies,butterfly-butterflies,peach-peaches,
watch-watches,fox-foxes,mouse-mice,zoo-zoos,goose-geese