1.一般名词直接+s2.以ce ge se ze结尾的+s3.以s x ch sh结尾的+es4.以 o 结尾有生命的+es无生命+s有生命：Negrohero potato momatmanger无生命：hippo piano radio photo5.以辅音字母+y结尾 改y为i+es6.以f或fe结尾去f或fe+ves有：wife knife wofe thief shelf self lief half leaf不规则：man变men woman变womenchild变children ox变oxenmouse变micetooth变teeth foot变feet以-...
