帮我把这篇英语作文改成过去式,有不好的地方帮我修改一下Last weekend . In the morning, I go out play with my grandparents! We came to the park, where the air is good, there are many beautiful flowers and trees. There are many elderly people in the exercise, my grandparents are doing the exercise, this is a good place. In the afternoon, I went to the Boulder Dam, I took many photos, I met one of my classmates and his parents, this is a happy Sunday, I am very happy.

帮我把这篇英语作文改成过去式,有不好的地方帮我修改一下
Last weekend . In the morning, I go out play with my grandparents! We came to the park, where the air is good, there are many beautiful flowers and trees. There are many elderly people in the exercise, my grandparents are doing the exercise, this is a good place. In the afternoon, I went to the Boulder Dam, I took many photos, I met one of my classmates and his parents, this is a happy Sunday, I am very happy.