1. If he takes a bus, he will arrive at 9.30.
2. If he meets our teacher, she will ask him about the party.
3.If she asks him about it, he will tell her the truth.
4. If he tells her the truth, she will know everything.
5. If she knows everything, she will be angry.
6. If she is angry, she will give us a lot of work to do.
7. If she gives us a lot if work to do, I will be very busy.