1. The pupils discussed) this problem yesterday .2. The pupils were discussing this problem the whole evening yesterday. 3. They (were discussing this problem from three till five o'clock. 4. They were discussing this problem at four o'clock yesterday. 5. They were discussing this problem when I came in. 6. She learnt a poem yesterday. 7. She was learning a poem at five o'clock yesterday. 8. She was learning a poem from five till six o'clock yesterday. 9. She was learning a poem when mother opened the door. 10. She was learning a poem the whole day yesterday. 11.1 did not see) him yesterday. I saw him two days ago. 12. She was not writing a letter at seven o'clock yesterday. She wrote) it two days ago. 13. Jane was reading the magazine from five till six o'clock last evening. 14. He studied a rule in the morning last Monday. 15. Last month our team lost the game. 16. What was she doing when the telephone rang? 17. Whom were they speaking to when I met them at the station? 18. They were having lunch when the telephone rang. 19. Nick was making a report at three o'clock yesterday. 20. Mike was writing on the blackboard when I came into the classroom. 21. She was not sleeping the whole night yesterday. 22. Who entered the room when you were watching television? 23. What were you thinking about when I asked you a question?