Does 'When I was teaching there, the explanation invariably given by boys brought to me for scrapping in the playground   Ee it oi, so oi it ee. ' provide a contradiction to the established premise 'I never worked at that school.'
When I was teaching there, the explanation invariably given by boys brought to me for scrapping in the playground   Ee it oi, so oi it ee. ###I never worked at that school.