Some cake是什么

two pieces of cakes:Wrong;
two pieces of cake:Right.when a cake is cut into smaller pieces;
some cake:Right,part of one cake
some cakes:Right,one cake ,two cakes,three cakes = some cakes

cake既是可数名词,又是不可数名词.有这样的词,某种情况可以用作可数,某种情况下不可数.
have some cake 表示这种物质,东西,不可数
还有 a piece of cake,也是这种情况.
I need to buy a cake for my son,for it is his birthday today.可数
A cake is a sweet food made by baking a mixture of flour,eggs,sugar,and fat in an oven.可数
Cakes may be large and cut into slices or small and intended for one person only.可数,而且有复数.
fruit也一样
在表示一个类别,及仅仅翻译成水果的时候,用fruit
例如
I like fruit and vegetables.
我喜欢水果和蔬菜.
只有严格区分是什么类别的水果,或者表示一种果实的时候才会作为单数处理,要加S
例如
They enjoy the fruits of their hard labor.
他们享受自己辛勤努力的成果.