Раскройте скобки, употребив нужную форму глагола в придаточных условных предложениях. Предложения переведите.

1. If you (to attend) all the classes, you will pass your exam.
2. He wouldn’t have been successful businessman if he (not to be) a very good manager.
3. If they (to sign) the contract last month, the goods would have been delivered now.
4. If I (to be) you, I would take this course.