帮我修改一下下这篇英语文章,

帮我修改一下下这篇英语文章,
帮我修改一下,看看有什么句子不够好的,帮我改改,越多越好．谢谢了!
we made an activity survey last week.we asked all students of class 12,grade 8.in our chart,most students watch tv every day.some students watch tv twice a week.others watch tv four times a week.about having sports,some students do it every day .20%students have sports twice a week.and most students have four times a week.all students do their homework every day.nobody does it twice a week or four times a week.we found that all students in class12,grade 8 study hard.and they also like having sports.

We carried out an activity survey last week. We asked all students in Class 12, Grade 8. And we drew a chart using the survey results.
In our chart, most students watch TV everyday. Some students watch TV twice a week. And others watch it four times a week.
Under sports activities, we have some students doing exercises everyday, 20% of the students play sports twice per week, and most students engage in sports activities four times a week.
All the students do their homework everyday. There is no exception on any of the days.
In conclusion, we found that all the students in Class 12, Grade 8 study hard and play hard, and they like sports activities very much.