1、cup通常指带柄的瓷杯,用来喝茶、牛奶、咖啡等,a cup of 指一杯的量,还可以用作比赛用的金杯、银杯.如：please pass me a cup of tea.who own the cup.
2、glass通常指玻璃杯,用以饮酒、喝水等.there is a glass on the table.will you have a glass of a beer?