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Can I say,

(a) A choir is / are singing.
(b) A group of choir is / are singing.
Comments  
Hi,

(a)You can't say "a choir are singing", because "choir" is singular, but you can say: "A choir is singing"

(b) " A group of choirs are singing"

A.-93
Thanks,

Can I say,

The choir are singing on stage / on the stage.
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No problem Emotion: smile,

choir=singular, so if you wanna use "are", you have to pluralize choir, and thats "choirs".

The correct phrase would be:

The choirs are singing onstage.
or: The choir is singing onstage.

Alex-93