grapefruit/grapefruits

[fungyf_hk]

Are both sentences correct? If so,which sentence is more natural or common?

1.Grapefruit is sour.
2.Grapefruits are sour.

 

[Mister Micawber]

1.A Grapefruit is sour. Grapefruit is not normally considered uncountable or a quality, though I could set up a context: 'Strawberry candy is sweet; grapefruit is sour'.

2.Grapefruits are sour.

If you add an article to the first, both are fine, both are common; just be consistent if you are writing a paragraph or essay on the topic.

 

[Tdol]

In British English, we often use the same form for the singular and plural, so I'd say 'grapefruit is\are sour' quite happily. ;-)