2. If my best friend forget about my birthday, I won't be busy tomorrow
3. If I am not busy tomorrow, I will save enough money this year
4. If I save enough money this year, I will finish my homework early today.
5. If I finish my homework early today, I will stay up late tonight.
6. If I stay up late tonight, I won't be very disappointed.
7. I won't be very disappointed if I have some free time next week.
8. If I have some free time next week, I won't be very disappointed.