4. of +名词的’s所有格形式或名词性物主代词称为双重所有格. 在表示所属物的名词前有冠词, 数词,不定代词或指示代词(如a, two, some, any, such, no, a few, this, that, these, those等)时, 常用双重所有格表示所属关系, 如: a friend of my father’s =one of my father’s friends, two brothers of his, some inventions of Edison’s, these poems of Li Bai’s, a few classmates of Xiao Ming’s, any friend of Tom’s, some houses of my grandfather’s.

关于双重所有格还需注意以下几点:

　　 ①.在双重所有格中, of前面的名词不和the连用, 如不能说: 　the new dress of Susan’s. 但若有定语从句在后, 则可以用the, 如可以说: the friends of my father’s who is going abroad

②.在双重所有格中, 作of宾语的名词必须是人, 而且是特指