What is the english grammar rule as to when to use “are” or “is”?

Published October 17, 2010

Question by scarllette288916: What is the english grammar rule as to when to use “are” or “is”?
For example, the sentence: “Either of you is welcome to reply with any necessary factual corrections.”
I can see where either “is” and “are” could be used and sound correct.
What is the deciding factor as to when to use “are” or “is”?
Thanks!!

Best answer:

Answer by choccy_002
‘are’ is plural, ‘is’ is singular egs they ARE late; he IS late.

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