Put the verb in brackets into the Past Indefinite? the Past Continuous, the Past Perfect and the Past Perfect Continuous.
1. Nobody (know) where Smith (go). 2. A girl who (stand) under the beech tree (come) up to us. 3. Mary (speak) to Mr Boxwell when I (see) her in the corridor this morning. 4. John (park) the car in Fifth Avenue when a young man in black glasses (appear) from nowhere and (stand) before him. 5. He again (come) to the village where he (live) in childhood. 6. While we (talk), there (come) a loud knock at the door. 7. He (look) into the drawing-room. The old man (sleep) peacefully in the armchair at the fire-place. 8. When their visitor (leave) John and his mother (stand) near the window. 9. When he (dress), he (go) downstairs, (write) a long letter to his parents and another to his sister. 10. She (welcome) her with a bright smile and (turn) back to the offensive dandy lions she (fight) with. 11. While she (read) this notice, a middle-aged woman (appear) in the doorway. 12. When he (come) back to the conference room, he (see) that the situation (change). 13. She (sit) at the table only five minutes when a car (come). 14. Their father (be) still silent, even when they (have) coffee. 15.The three (sit) down to the meal that Susan (prepare). 16. He (sit) thinking of his wife whom he (leave) alone in Europe. 17. They (look) over the accounts together and (find) where she (make) her mistake. 18. I (be) surprised at John's failure because he (be) such a good student previously.