I just wondered if the pronoun necessarily has to be "
í" (just because "fianaise" is feminine)?
For example, if, in context, the thing that is evidence, referred to by the pronoun, is either a masculine noun or an abstract idea/fact (eg in the Sherlock Holmes story "Silver Blaze", the fact that the dog didn't bark is evidence, of a kind), wouldn't "
é" be appropriate?
Here are a couple of examples I've found:
It would depend on the function of the pronoun in the copular statement — whether it’s a subject, a predicate, a subsubject, or a subpredicate. In this exercise, í seo is a subject, so it wouldn’t have to agree with the predicate’s gender. If I’ve understood the courts.ie example correctly, é sin is also a subject, so it wouldn’t need to agree either. In the NEID example, é is a subsubject, so it’s agreeing with an t-éileamh rather than with fianaise.