Put the verbs into past continuous, past perfect, past simple. 1) the browns (leave) for moscow a month ago. 2) boys (ride) their bikes at 4 o'clock yesterday. 3) we (arrive) at the theatre before the performance (begin). 4) sam (do) his homework from 5 to 6. 5) when i (phone), ann already (clean) her parrot's cage. 6) the old lady (water) the flowers at that time. 7) tom (change) his mind by that time.