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Mr Green used to be happy, but now he lives by himself feeling lonely and unhappy. So he goes for a walk in the park everyday.
Today I met him in the park and walked along with him. I promised to accompany him everyday, which made him happy again.

Mr. Green use to be very happy, but now since he live alone, he feels very lonely and unhappy. Therefore,he goes to have a walk in the park everyday.
Today, I met him in the park and walked with him, I promised him that I will accompany him everyday, so he laughed happily.