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9. He would accept the job if the salary were high.
Provided
10. I will pay you the money if you do it for me.
On.......
11. If he hadn't given me the money, I couldn't have solved the problem.
But ........
12. She must tell the police, or the problem will get worse.
If
13. I didn't take part in the competition, so I feel so sorry now.
If.
14. Join the English club, and you will become more self-confident.
If...
15. He feels very sorry now because he didn't help that boy.
If...
16. If she hadn't trusted me, I wouldn't have had a chance to prove myself.
Without....
17. I only came up the stairs because the lift wasn't working.