Gerald remembers the Eva had to 'leave on strike' and said 'something about a shop to' and therefore confirms the story of Mr Birling and Shelia. Therefore, Gerald knows that Eva is the same person, yet he later suggests 'there's still no proof it was the same person'. Here, Gerald is trying to excuse his own behaviour and also convince himself he is innocent, by breaking the chain of events and therefore implying that his actions did lead to suicide