Ответ:

1. If Sam had gotten up early, he wouldn't have been late for class.

2. If we had brought our umbrellas, we wouldn't have gotten wet.

3. If Jake had studied, he wouldn't have failed the test.

4. If I hadn't ridden the bicycle, I wouldn't have fallen off.

5. If I hadn't met him yesterday, I wouldn't have known his name.

6. If the TV hadn't been broken, they wouldn't have been bored.

7. If Isaac hadn't sat under a tree, an apple wouldn't have fallen on his head.

8. If Kevin hadn't gotten lost, he wouldn't have cried.

9. If Jenny hadn't practiced a lot, she wouldn't have won the contest.

10. If the firemen hadn't arrived, they wouldn't have put out the fire.