Giving recommendations and opinions
When you think something is a good idea
Cyclists should be required to wear a helmet.
Pet owners shouldn't be allowed to walk dogs without a leash.
People ought to be required to end parties at midnight.
When you think something is absolutely necessary
Laws must be passed to control the noise from car alarms.
People mustn't be permitted to park motorcycles on the sidewalks.
A rule has to be made to require cycling lanes on city streets.
Something has got to be done to stop littering.