there is a big cake on the table.after dinner,we have some cake.在这里蛋糕为什么不可数还有一个句子是mum buys some cakes for me.
问题描述：
there is a big cake on the table.after dinner,we have some cake.在这里蛋糕为什么不可数
还有一个句子是mum buys some cakes for me.
答
cake本来就是不可数名词，前面可以加a piece of或者two pieces of来形容
答
cake不可数,用a piece of 修饰
而后面的句子,some cakes是写有许多种蛋糕,cake加s,看似复数形式,是表示种类,还有fish本身也不可数,如果说fishes就是不同种类的鱼.
明白了吧.