staff是可数名词还是不可数名词

staff可数集合名词第一类\x0d形式为单数,但意义可以用为单数或复数这类集合名词包括family(家庭Y:'Times New Roman'">family(,team(队),class(班),audience(听众)等,其用法特点为：若视为整体,表示单数意义；若考虑其个体成员,表示复数意义.比较并体会：His family is large.他的家是个大家庭.His family are all waiting for him.他的一家人都在等他.This class consists of 45 pupils.这个班由45个学生组成.This class are reading English now.这个班的学生在读英语.\x0d这个班的学生在读英语.第二类\x0d形式为单数,但意义永远为复数这类集合名词包括cattle(牛,牲畜)cattle(,people(人),police(警察)等,其用法特点为：只有单数形式,但却表示复数意义,用作主语时谓语用复数；不与 a(n) 连用,但可与the连用(连用).如：People will laugh at you.人们会笑你的.The police are looking for him.警察在找他.Many cattle were killed for this.就因为这个原因宰了不少牲畜.注：表示牲畜的头数,用单位词 head(单复数同形).如：five head of cattle 5头牛,fifty (head of ) cattle 50头牛 第三类\x0d形式为复数,意义也为复数这类集合名词包括goods(货物),clothes(衣服)等,其用法特点是：只有复数形式()当然也表示复数意义,用作主语时谓语也用复数),但通常不与数词连用.如：Clothes dry slowly in the rainy season.衣服在雨季不易干.Such clothes are very expensive.那样的衣服很贵.If goods are not well made you should complain to the manufacturer.如果货物质量不好,则理应向制造商提出控诉.第四类\x0d形式为单数,意义也为单数这类集合名词包括baggage / luggage(行李),clothing(衣服),furniture(家具),machinery(机器),poetry(诗),scenery(风景),scenery(),jewelry(珠宝),equipment(设备)等,其用法特点为：是不可数名词,只用单数形式,不用不定冠词(当然更不能用数词),没有复数形式.如：Our clothing protects us from [against] the cold.我们的衣服可以御寒.Have you checked all your baggage?你所有的行李都托运了吗?The thief stole all her jewelry.小偷把她所有的首饰都偷走了.The hospital has no decent equipment.这家医院没有像样的设备.The Tang Dynasty is thought of as the high summer of Chinese poetry.人们认为唐朝是中国诗歌的全盛时期.注：machinery,poetry,jewelry,scenery等相应的个体可数名词是 machine,poem,jewel,scene等.如：a poem / a piece of poetry 一首诗many machines / much machinery / many pieces of machinery 许多机器 第五类\x0d1.hair(头发,毛发)\x0d指全部头发或毛发时,为集合名词(不可数)；指几根头发或毛发时,为个体名词(可数).如：My hair has grown very long.我的头发已长得很长了.The police found two hairs there.警察在那儿找到了两根头发.\x0d2.mankind(人类)\x0d人是一个不可数的集合名词,不用复数形式,也不连用冠词.如：This is an invention that benefits mankind.这是一项造福人类的发明.Mankind has its own problems.人类有自己的问题.注：mankind 表示“mankind 人(类)”时,虽不可数,但有时却可以表示复数意义,尤其是当其表语是复数时.如：Mankind are intelligent animals.人是理智的动物.\x0d3.fruit(水果)\x0d作为集合名词,它通常是不可数的.如：He doesn’t eat much fruit.他不大吃水果.He is growing fruit in the country.他在乡下种水果.但是,当要表示种类时,它可视为可数名词,即a fruit 指一种水果,fruits 指多种水果.比较：fruits Some fruits have thick skins.有些水果皮很厚.