一,名词的数我们知道名词可以分为可数名词和不可数名词,而不可数名词它没有复数形式,但可数名词却有单数和复数之分,复数的构成如下:一)在后面加s。如:fathers, books, Americans, Germans, apples, bananas二)x, sh, ch, s, tch后加es。如:boxes, glasses, dresses, watches, wishes, faxes三)1)以辅音字母加y结尾的变y为i再加es 如:city-cities body-bodiesfactory-fctories, baby-babies, family-families, duty-duties, comedy-comedies, dstory-stories2)以元音字母加y结尾的直接加s。如:day-days, boy-boys, toy-toys, key-keys, ways四)以o结尾加s(外来词)。如:radios, photos, 但如是辅音加o的加es:如: tomatoes西红柿, potatoes马铃薯五)以f或fe结尾的变f