No, it hasn't. It's very dirty.
Someone ought to clean it today.
Mark should clean it. It's his turn.
No, he cleaned it last time. It's your turn.
No, it isn't. You always clean it after Mark.
Oh dear, is it really my turn? In that case, I'll clean tomorrow.
Clean it now. Only lazy people say they'll work tomorrow.
Then I'll clean it the day after tomorrow.