1. bread意为“面包”，是不可数名词（U,n）。如：

Would you like some bread and butter ?你要吃点奶油面包吗？

A loaf of bread , please .请给我一块面包。

How many slices of bread would you like? 你要几片面包？

2. sandwich意为“三明治”是可数名词（C,n）, 其复数形式加-es。

Some fast- food restaurants also serve ~es, coffee, and soft drinks. 有些快餐店也供应三明治、咖啡和软饮料。

You put a slice of ham between two slices of bread to make a ham sandwich. 你在两片面包中间放上一片火腿，就做成了火腿三明治。

3. hamburger意为“汉堡包”，既可作可数名词，又可作不可数名词（U&C,n）。如：

Peter said that he liked ~s.彼得说他喜欢吃汉堡包。

- How about buying some ~?买点汉堡包怎么样？

- I like ~.我喜欢吃。