1.一般情况 加-s
cap→caps dog→dogs bike→bikes driver→drivers
2.以字母s, sh, ch, x等结尾 加-es
bus→buses wish→wishes watch→watches box→boxes
3.以辅音字母+y结尾 变y为i再加-es
lady→ladies century→centuries
4.以f或fe结尾 一般变f, fe为v,再加-es
leaf→leaves life→lives
5.以o结尾 o前为辅音音素时加-es, o前为元音音素时加-s。 tomato→tomatoes hero→heroes potato→potatoes
zoo→zoos photo→photos piano→pianos