> Is the conjugation of the verb "to be" an exception, or is it covered by a very specific rule that only applies to that particular verb? I guess in the end it could be a matter of definition. But if this is supposed to be one of those "very complex — perhaps even unpredictable, or irregular [rules]," as the grandparent would apparently have it, then I have to question what his definition of an "exception" would be. Are there any exceptions to grammar rules at all?
My point was more that exceptions are rules too. ‘The verb be is conjugated like X, go like Y, and other verbs like Z’ is still a rule, albeit a complicated one, and one which could alternately be rephrased in terms of ‘exceptions’, insofar as that would be at all useful. Truly irregular, unpredictable exceptions — such as are so common in chemistry — are in fact rather rare and restricted in human languages.
My point was more that exceptions are rules too. ‘The verb be is conjugated like X, go like Y, and other verbs like Z’ is still a rule, albeit a complicated one, and one which could alternately be rephrased in terms of ‘exceptions’, insofar as that would be at all useful. Truly irregular, unpredictable exceptions — such as are so common in chemistry — are in fact rather rare and restricted in human languages.