沒有區別，all of the偏向美國英語的用法。個體代詞all具有名詞和形容詞性質，在句中可用作主語、賓語、定語等。指二以上的人或物(指二個用both)。all相當於名詞時，在美國英語中常與of 連用(在英國英語中一般皆不用of)。all of的意思與all相同。如：All of the boys want to become football players. 所有孩子都想當橄欖球運動員。All of these books are expensive. 所有這些書都很貴。也可後跟不可數名詞，表示單數。如：All of that money you gave them has been spent. 你給他們的那些錢全花完了。All of the bread was stale. 所有的麵包都不新鮮了。有時亦可後跟單形可數名詞。如：His action was condemned by all of the civilized world. 他的行動受到整個文明世界的譴責。只有all of 之後才可跟人稱代詞或關係代詞的賓格形式。如：All of us were disappointed by him. 他使我們大家都失望了。He has written three novels, all of which were best sellers. 他寫了三部小說，這三部小說都是暢銷書。
沒有區別，all of the偏向美國英語的用法。個體代詞all具有名詞和形容詞性質，在句中可用作主語、賓語、定語等。指二以上的人或物(指二個用both)。all相當於名詞時，在美國英語中常與of 連用(在英國英語中一般皆不用of)。all of的意思與all相同。如：All of the boys want to become football players. 所有孩子都想當橄欖球運動員。All of these books are expensive. 所有這些書都很貴。也可後跟不可數名詞，表示單數。如：All of that money you gave them has been spent. 你給他們的那些錢全花完了。All of the bread was stale. 所有的麵包都不新鮮了。有時亦可後跟單形可數名詞。如：His action was condemned by all of the civilized world. 他的行動受到整個文明世界的譴責。只有all of 之後才可跟人稱代詞或關係代詞的賓格形式。如：All of us were disappointed by him. 他使我們大家都失望了。He has written three novels, all of which were best sellers. 他寫了三部小說，這三部小說都是暢銷書。