1)i blame you /yourself for this mess 2)the wind has blown /been blowing hard all morning 3)somebody stole / was stealing our car last night 4)when i was young/ i would / used to believe in ghosts 5) by the time we caught him,he had stolen / stole 20,000 6) this is the first time i could / have been able to understand computers 7)the bus to london leaves / will leave at five o'clock every day 8)if we left now, we would / will be there by teatime