Unless you stop smoking, you will have lung disease soon

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20. Unless you stop smoking, you will have lung disease soon.
21. If Mike ate breakfast this morning, he wouldn't be hungry now.
22. If I knew Egyptian history, I could answer his question.
23. Had you met John yesterday, he will give you a hand in this problem.
24. Will you pass me the salt if I asked you to?
25. If they offer you this job, not accept it.