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every和each用法： every是形容词,只能作定语修饰单数名词,意思是每一个,表示整体概念; each是形容词、代词,可用作主语、宾语、定语等,意思是每个或者各个,表示单个概念;each可以放在名词前,可以后跟of短语,与动词同时出现时要放在be动词、助动词、情态动词之后或者行为动词之前 every和each都用作单数理解,但是下文中既可以用单数的代词也可以用复数的代词替代。如：Every one of the students in his class studies very hard. / They are very busy. Each of them has something to do. either和neither的用法： either意思是两个中间的任何一个neither是either的否定形式,意思是两个都不。 neither和either在句子中可作主语、宾语和定语等,都用作单数。如：I dont care much for what to drink. Either of the two will do. / --Will you go there by bus or by car? Neither. I will go there by train. other、the other和another的用法： other意思是另一、另一些,有复数形式。在句子中可作主语、宾语和定语。another意思是另外、又一个,表示增加,在句中可作宾语和定语。如： Some girls are singing under the big apple tree and others are sitting on the grass talking. / You have had several cakes. Do you really want another one? / I want another four books. | 
