When using "who" in a question, which is correct:
Is it I who has erred? Is it I who have erred?
The latter seems correct by test (take out who), but the former seems correct by question form (singular, but take out I).
When using "who" in a question, which is correct:
Is it I who has erred? Is it I who have erred?
The latter seems correct by test (take out who), but the former seems correct by question form (singular, but take out I).