tomatoe是可数名词。

tomatoesn ．番茄；西红柿tomato 的复数例句：Tomatoes grow best in direct sunlight .西红柿在阳光直射下长得最好。Now cut the tomatoes in half .把西红柿都切成两半。Remove the skins by soaking thetomatoes in hot water .把西红柿放在热水里烫一下去皮。Choose medium to large tomaoes .

都不是可数，马铃薯：potatoes，西红柿：tomatoes，芒果：mangoes！都是加es的可数名词！