tomato和tomato是不是都有复数?怎么加的?

结尾是o的单数词,一部份只加s就成复数词,但有的却需加es
piano pianos
photo photos
bamboo bamboos
zoo zoos
kangaroo kangaroos 袋鼠
mulatto mulattos 白黑混血儿
hero heroes
mango mangoes
potato potatoes
volcano volcanoes
negro negroes 黑人
cargo cargoes
echo echoes
buffalo buffaloes
tomato tomatoes
mosquito mosquitoes