1、直接加s,如:belief---beliefs roof---roofs;
safe---safes gulf---gulfs;
chief----chiefs cliff---cliffs
2、去f,fe 加ves,如:half---halves knife---knives
leaf---leaves wolf---wolves
wife---wives life---lives
thief---thieves
3、都可以加的 ,两者都可以。如:handkerchief: handkerchiefs / handkerchieves
hoof: hoofs/hooves
追问对不起,您的回答没有帮到我