有错,有的属于语法,有的属于惯用法.我觉得文章里重复太多.以下是我的修改：
Like all things around the world,there are both pros and cons of watching TV.But,it is every difficult to determine whether the positive effects out weigh the negative effects or vice versa.The influence is very difficult to measure.It’s more difficult to judge what is good and what is bad.I think there is one positive aspect,that is,many people care about the influence of TV,and if there are things we don't like.we have the capability to change them.