Make conditional sentences according to the facts provided

Make conditional sentences according to the facts provided
1. Today is not Sunday. We have to get up early
2. My younger sister is not old enough. That's why she can't go to school  by herself
3. I did not know how to do the exercise because I was absent from class yesterday
4. Tóm failed the exam because he didn't study hard enough
5. She did not come because she did not know you were here
6. We lost our way. We did not arrive on time
7. We could not save his life because we did not find him earlier
8. You must go now or you will be later for school
9. They did not have a map. So they got lost
10. Năm won't be successful unless he works hard