A dirty car

John, Peter and Mark are brothers. Their father has a new car, and they clean it for him. It has just rained, and the car is very dirty. John is looking at it, and he is talking to Peter.

JOHN: The car hasn't been cleaned for a few days.

PETERL: No, it hasn't . It's very dirty.

JOHN: Someone ought to clean it today.

PETER: Mark should clean it . It's his turn.

JOHN: No, he cleaned it last time. It's your turn.

PETER: No, it isn't. You always clean it after Mark.

JOHN: Oh dear, is it really my turn? In that case, I'll clean tomorrow.

PETER: Clean it now. Only lazy people say they'll work tomorrow.

JOHN: Then I'll clean it the day after tomorrow.

PETER: You are lazy. You ought to be ashamed? You should enjoy working.