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We say 'Eat plenty of fruit and vegetables.' If I have eaten an apple, can I say 'I have eaten a fruit' if I do not want to specify what fruit I have eaten?
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Hi,

No, say I have eaten some fruit.

You could also say I have eaten a piece of fruit, but that would sound quite stilted in some contexts.

Best wishes, Clive
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As you can see here, fruit can be both C and U (Uncountable)

http://dictionary.cambridge.org/define.asp?key=31470&dict=CALD

but I agree with Clive for your case.
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Hi Clive,

Please tell me why you cannot say "I have eaten a fruit" when you don't want to specify which fruit (one??) you have eaten? A dictionary definition might well be something like this:

An apple is a round fruit that ...
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Hi,

Please tell me why you cannot say "I have eaten a fruit" You can say it, but it will sound very odd to a native speaker.

when you don't want to specify which fruit (one??) you have eaten?Why don't you want to specify? Is it a secret?Emotion: smile That's partly why it sounds unnatural.

Best wishes, Clive