both 是"兩者都" ,所以后面應(yīng)該用名詞復(fù)數(shù),而且最好是兩個(gè)的.
eg;both side of the street
each是”每一”,是指至少三個(gè)以上中的每一個(gè),后面接名詞單數(shù)．
eg.each student of the class
all 是全部,至少三個(gè)以上的全部,后面接名詞復(fù)數(shù)或者不可數(shù)名詞或單獨(dú)用
eg.all the students & all the fish
either 是兩者任一,后面直接接名詞單數(shù)．或者可以單獨(dú)用
eg.either of the two students
neither 是兩者任一都不,用法基本同上．
eg.Neither of the two students got the highest score.