You... make sure that painting's genuine before buying it. There are some very good fakes around.
should, must
There .... be huge traffic jams on this freeway some days, but it's usually fine.
can
David ... be happy that the Cowboys won today. He's a big fan.
will - must - should
It ... rain later. The forecast said there was a 50% chance.
might, may, could
It'll be a miracle if we get to the airport on time, but we ... just make it.
should, might, may, could
Janice... be upset that she's been downsized. She was going to leave anyway.
won't, can't
That's ... Roberta's mother. She looks way too younger.
can't
It... be San Francisco in the background of that photo. That's definitely the Golden Gate Bridge.
must