具体名词抽象化一些表示部门、机构或公共场合的名词在与介词in , to, at, after连用时，常失去可数名词的具体意义 go to school (bed, college), finish school (college), in class, at table数量词 + of 结构中，of后的名词可能抽象化 What sort of book do you want? He is not the kind of person to idle away his time.表示交通工具的名词 bike, car, bus, boat, train, plane, ship, trolley, freight表示身份的可数名词在系动词turn后作表语时 He used to be a teacher till he turned writer.单数可数名词用在as, though 引导的倒装让步状语从句中，该名词就转化成抽象名词 Girl as she is, she knows a lot of
