[Grammar] He is eating watermelon.

[sitifan]

1. He is eating a watermelon.
2. He is eating watermelon.

3. He is eating watermelons.

Are the above sentences all acceptable?​

[SUB][/SUB]​

 

[Raymott]

Only 2 is common and normal. But there are limited scenarios where the others might be better - i.e. if he is eating a full watermelon or multiple watermelons.

 

[Rover_KE]

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Given the enormous size of most varieties of watermelons, only #2 is likely.

Or 'He's eating a slice of watermelon'.

 

[jutfrank]

Are the above sentences all acceptable?

'Acceptable'? What do you mean? Do you mean 'grammatical'? Yes.

Obviously, they each have different meanings.