1. If I were you, I would go to the doctor right away.
2. If I knew French, I would communicate with him in French.
3. If he should come tomorrow, what would you do?
4. I wish (that) he would accept our suggestion.
5. If only he could make a report to us next week.
6. They demand that the book (should) be published next week.
7. It is necessary that everyone (should) master one foreign language.
8. It's high time that you started off.