Some fruit. Three PIECES of fruit. Different fruit. Six different KINDS of fruit.

Actually the noun "fruit" could be countable, as well. Consider the sentence, "Fruit salad is a way of making different fruits into a dessert".

The word "fruit" is generally an uncountable noun. Some people use it occasionally as a countable noun, but most of the time I think that sounds awkward and harsh on the ear. The only time I would use it in the plural would be in the expression "the fruits of one's labour". There is lots of geographical variation though. The plural usage would appear to be more common in North America, as opposed to almost non-existent in the UK.

Fruit is usually used as a mass noun, and then it is used in its singular form. For example: My doctor advises eating a lot of fruit. I could make a fruit cake. I bought some fruit at the market - bananas, oranges and apples. However, the plural form ªfruitsª is sometimes used, in specific contexts. In that case, 'fruit' means 'the outcome of something, a successful result, or the part of a plant which develops from a flower'. You can use it also as a plural noun to denote different sorts of fruit. Hmmm, for example: What are the fruits of our work? The fruits of this land are ample. Which fruits can you use in the production of brandy?

"Fruit" is an uncountable noun, for example: Children should eat a lot of fruit and vegetables every day.