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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

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