1. When we ... at the station yesterday the train ... already ... . (arrive)(leave) 2. I belive the train...soon. (arrive)
3. She is a teacher. Shebiology at school. She...a teacher for ten years. She beology for ten years. (teach)(be)(teach)
4. Albert Einstein the Theory of Relativity. (develop)
5. Water from the seas and oceans into the atmosphere. (evaporate)
6. The clothes...yesterday. (pack)
7. The clothes...tomorrow. (pack)
8. I'll call him back later. I...my suitcases. I...them since breakfast. (pack)
9. His grandmother wants him...his clothes. (pack)
10. Do you expect him...his clothers? (pack)
11. If he ... his clothes on time, his grandmother will let him ... to the park. (pack)(go)
12. I wonder if he ... hus clothes tomorroy. (pack)
13. While Larryhis suitcase Jane ... sandwiches. (pack)(make)
14. Yesterday Larry ... his suitcase when the taxi . (pack)(arrive)
15. Larry his suitcase before the taxi . (pack)(arrive)

1. When we arrived at the station yesterday the train .had already left.(arrive)(leave)

2. I belive the train will arrive soon. (arrive)

3. She is a teacher. She teaches biology at school. She has been a teacher for ten years. She has been teaching beology for ten years. (teach)(be)(teach)

4. Albert Einstein developed the Theory of Relativity. (develop)

5. Water evaporates from the seas and oceans into the atmosphere. (evaporate)

6. The clothes were packed yesterday. (pack)

7. The clothes will be packed tomorrow. (pack)

8. I'll call him back later. I am packing my suitcases. I have been packing them since breakfast. (pack)

9. His grandmother wants him to pack his clothes. (pack)

10. Do you expect him packing his clothers? (pack)

11. If he packs his clothes on time, his grandmother will let him go to the park. (pack)(go)

12. I wonder if he will pack thus clothes tomorroy. (pack)

13. While Larry is packing his suitcase Jane is making sandwiches. (pack)(make)

14. Yesterday Larry was packing his suitcase when the taxi arrived. (pack)(arrive)

15. Larry had packed his suitcase before the taxi arrived . (pack)(arrive)