1. If Robert goes (go) to bed late, he (sleep in).
2. If he (sleep in), he (miss) his bus.
3. If he (miss) the bus, he (be) late for work.
4. If he (be) late for work, his boss (be) angry.
5. If Robert’s boss (be) angry, he (fire) him.
6. If Robert (lose) his job, his girlfriend (get) upset with him.
7. If Robert’s girlfriend (get) upset again, she (break up) with him.
8. If she (break up) with him, he (be) lonely.
9. If Robert (feel) lonely, he (call) some friends.
10. If Robert (call) his friends, they (ask) him to their party.
11. If Robert (go) to the party, he (drink) too much beer.
12. If Robert (drink) too much beer, he (need) a ride home.
13. If Robert (need) a ride home, he (have to) stay until the end of the party.
14. If Robert (stay) until the end of the party, he (get) home very late.
15. If Robert (get) home late, he (go) to bed late.