12. My brother will have enough money. He will buy a bicycle. If . 13. He didn't have time. He didn't read this novel. If . 14. Because she missed the bus, she was late. If . 15. Peter doesn't study hard, so he can't get good marks. If . 16. My sister is absent from her class because she has a terrible headache. If . 17. Windy didn't come, so we cancelled the meeting. If . 18. He was angry, so he didn't say anything. If .