I’d rather that you ______ the operation right away.

He _______ have escaped, but he chose to stay and fight.

－ What does the sign over there say?－ “No person ____________ bring drinks into the student computer pool.”

If Greeks and Turks had not helped each other after the earthquakes five years ago,they____ mortal enemies instead of friendly neighbors later on..

 Food safety has become a growing concern. Had the offenders been punished severely enough, the situation________ different now.