Use of should
should for advice, opinions
We often use should when offering advice or opinions (similar to ought to):
• You should see the new James Bond movie. It's great!
• You should try to lose weight.
• John should get a haircut.
• He shouldn't smoke. And he should stop drinking too.
• What should I wear?
• They should make that illegal.
• There should be a law against that.
• People should worry more about global warming.