1c MAKE A DIFFERENCE

TREES

SAVE

STREET

BAGS

GRAMMAR(must-have to)

I must / have to go to school every day

We don't have to cook tonight. We have soup in the fridge.=it isn't necessary .

You mustn't / can't use your mobile phone in the hospital =it isn't allowed.

NOTE 

THE past tense of must /have to is had to.LIGHTS