Образуйте Past Simple.

1. He (to lose) his balance and (to fall).
2. Ann's grandfather (to found) his firm in 1901.
3. Clearing out the room I (to find) these old letters.
4. The lion (to jump) and (to spring) at her.
5. I suddenly (to see) a face in the window.
6. The train (to start off) with a jerk.
7. The police (to open) fire and (to wound) two criminals.
8. He (to lie) there for an hour till someone finally (tо hear) his cries for help.
9. We (to meet) last summer.
10. I (to decide) to stay with my uncle until I (to find) a flat.
11. As it (to grow) darker, we (to find) it hard to walk.
12. The critic (to write) a very bad review of my play.
13. We (to go) for a walk every day before lunch.
14. It (to happen) a long time ago.

1. He lost his balance and fell.

2. Ann's grandfather founded his firm in 1901.

3. Clearing out the room I found these old letters.

4. The lion jumped and springed at her.

5. I suddenly saw a face in the window.

6. The train started off with a jerk.

7. The police opened fire and wounded two criminals.

8. He lied there for an hour till osmeone finally heard his cries for help.

9. We met last summer.

10. I decided to stay with my uncle until I find a flat.

11. As it grew darker, we found it hard to walk.

12. The critic wrote a very bad review of my play.

13. We went for a walk every day before lunch.

14. It happened a long time ago.

Объяснение время. Последующие обозначения:

P-подлежащее; V-глагол

формула утвердительного предложения - P + V2/ed  

формула отрицательного предложения - P + Did Not + V1.

формула во предложения - DID + P + V1

см. прикреплённый файл