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....