all 后面可以加 of ,但是什么时候加什么时候不加是要根据句子的语境而定的. 例如: A:Which one do you like? B:Oh I like all of them. All of our products carry a one year warranty. We are proud of all the girls who participated in this contest. 所以不能一概而论. 补充回答:当all 置于句首和后面的词合并为主语时,多半不加,甚至能说不可加 of.例如: All man are created equal. All students must attend the graduation ceremony. All I wanted is a simple answer.