Carver's Story Wavers Between Present Tense and Past Tenses

The story wavers between present tense and past tense constantly. There's someone telling a story and there's someone living a story, and they are both happening at the same time. The guilt and shame of bei alcoholic and what he's done in his life is going on for him. And then he gets to that moment an why so es y? Bringing something beautiful from the past into the present. Maybe that accounts for the blurring that he made a positive step.