Your father didn't turn off the lights when he left the room. What should you do?
You should remind him to turn the lights off./ You should turn them off.
You want to reduce waste. What should you do?
We should recycle materials. (paper, glass, plastic)
There is a big drought nowadays all around the world. What should you do?
We should take shorter showers. / We shouldn't waste water. / We should fix the leaks. / We should turn off the tap when we don't use it.
Your neighbours waste their food. What should you say to them?
"You should compost your leftovers."
You want to reduce the use of plastics. What should you do?
We should use reusable bags instead of plastics.
You want to reduce air pollution. What should you do?
We should use public transportation./ Factories should use air filtre.
You see someone littering in the park. What should you do?
I should warn him/her.
Your sister didn't seperate your garbage for recycling. What should you say to your sister?
"You should sort out your rubbish. / You should seperate your garbage."