L64：He suggested that a double railway-tunnel should be built.
L65：He should have known that the police would never allow this sort of thing.
L65：Of course, we should arrest him, but as he has a good record, we shall let him off this time.
L74：They had taken special precautions so that no one should recognize them.
L89：Many of the artists who should have appeared did not come.
L89：We all know what the poor man should have said, but what he actually said was.
L94：They should encourage those among us who cannot swim five yards before they are gasping for air.
