three pens.。不可数名词一般没有复数形式。如 water, some water。Р可数名词复数规则变化:Р1.一般在词尾加-s. book—books pen---pens cake---cakesР2.以 s, x, ch, sh 等结尾的名词加es。Рbus---buses box---boxes class—classesР3.以辅音字母+y结尾的词,变y为i, 再加—es。family—familiesР4以f (fe) 结尾的词,f (fe) 变为 ves 。knife---knivesР特殊单词:man - men woman- women mouse- mice Рfoot - feet Chinese - ChineseР需要注意的是,名词复数是在其后加-s(es), 而其他词(如代词等)的复数则是根据意义而变化。如:Р this( 这个) --- these( 这些) that (那个) --- those(那些) Р I (我)--- we (我们) my (我的) ---our (我们)Рhe/she/it (他/她/它)--they (他们)Рhis/her/its(他的/她的/它的)--their(他们) Рis/am---areР 如果我们要把单数句子变成复数句子时,不仅要把名词变成复数形式,而且还应该把单数意义的词变为复数意义的词。如:РThis is an egg.--- These are eggs. What’s that ?---- What are those?РIs it a box ? --- Are they boxes? He is an English boy. -- They are English boys.
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