Which modal verb do we use to express ability or permission?
Can and can't
If the ice caps melt...
the sea level will rise
Which modal verb do we use to express recommendation and advice?
Should and shouldn't
Reduce, Reuse, and Recycle, a.k.a. ...
The three Rs of waste management
Which modal verb do we use to express obligation and prohibition?
Must and mustn't
What kind of answers can we get if we ask "Should I...?", "Can I...?" or "Must I...?"?
Yes/no answers, but if we use an interrogative pronoun, we can get an open answer
Which are some of the environmental problems that produce climate change?
Light pollution, plastic pollution, air pollution, water pollution and deforestation
How is the word "should" pronounced?
/ˈʃʊd/, the L is silent
"Ought to" is an equivalent of...
Should
When do we use imperatives?
For orders, instructions, warnings and to motivate and encorage