Right: We must protect the environment., Companies have to follow green policies., You don’t need to be an expert to help., She doesn’t have to use plastic bags., We should not waste water., Must everyone attend the meeting?, Does he have to go to the conference?, Governments must invest in renewable energy., Shouldn’t we do something about climate change?, Do you need to sort the trash?, Wrong: People should to recycle more., Do we must act now?, Citizens need participate in the project., They needn’t bringing their own cups., You have to wears a mask at the factory., All countries needs to sign the agreement.,

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