If you clean the floor, , you can use the new mop., If you cleaned the windows,, they wouldn't have fingerprints., I'll buy you a pizza, , when I get paid next week., I'd buy you a diamond, if I could afford one., If we had left earlier, , We would have missed the train., Unless we leave now, , we'll miss the bus., We'll run out of petrol, if we don't fill up the tank soon., We'd use less petrol, if we didn't drive everywhere., When I go to London, , I'll stay with some friends., If I went to London, , I'd visit Buckingham Palace..

First vs second conditional

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