1．一般名词复数是在名词后面加上“s”,如map→maps,bag→bags等；2．以s,sh,ch,x等结尾的词加“es”,如bus→buses,watch→watches等；3．以辅音字母＋y结尾的词,变y为i加es,如baby→babies等；以元音字母＋y结尾...