1. Mary doesn't see the sight. She can't tell you about that. If.... 2. It wasn't fine yesterday. We didn't go for a walk. If.. . 3. I saw it with my own eyes. I believed it. If.. . 4. The accident happened because the driver didn't see the stop sign. If.. .. 5. You can't come late or they won't let you in. If..... 6. I don't know Greek, so I can't tell you about that. If.... 7. Gravity keeps people from being hurled off the earth as it whirls around. If.. . 8. Stop talking or you won't understand the lesson. If.. . 9. The church bells keep me from sleeping. If.... 10 Go right now or you'll be late for the train If....