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 went out play with my grandparents! We came to the park, where the air was good, there were many beautiful flowers and trees. Therewere many elderly people in the exercise, my grandparents were 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.
帮你改过了,只是文中好像有一些语法错误没事没事，如果有一些语法错误的，帮我改一下好么，意思变了没关系。。。OK嗯嗯，谢谢，感激不尽Last Sunday . In the morning, I went to the parkwith my grandparents! The air was good, there were many beautiful flowers and trees.Many old people weredoing morningexercise, my grandparents were doing morning exercise too. 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 felt very happy.最好把作文的整个意思或者提纲发一下。没什么提纲，就是胡乱写的，，，主题就是A happy weekend，我也没什么要求，交上去能有5分就可以了哦