Tony has just got an e-mail from his pen friend(改为一般疑问句） Saving our world is our duty同义句
问题描述：
Tony has just got an e-mail from his pen friend(改为一般疑问句） Saving our world is our duty同义句
you mustn’t throw away paper here and there祈使句
答
Has Tony just got an e-mail from his pen friend?
It's our duty to save our world.
Don't throw away paper here and there.