my composition ,who can help me correct the mistake?

Although training classes or hutors have a lot of（改为some，因为你基本上是对它持否定态度，所以a lot of不好） advantages,it have its disadvantages as well. For example,it may make the students are used to depending（从are开始改为depend） on the teachers. What's worse, hiring tutors or attending training classes may cause some students listen（改为to treat） their regullar（regualr） classes careless（carelessly）.
In my opinion, training classes isn't（aren't） necessary for us. As I know,there are many people attending different kinds of training classes in my class. I think this part of（用these） student's parents give（them） support to do that. Because（because不宜单独成句，将前面的句号改为逗号） they think it is good for their children's study. At our school , a large portion of（用most就可以了） teachers don't support that. Of cause ,they never forbid（改为interfere with the students' choices). There are times when we finish our study ,do any other things(这句话意义含糊，考虑理顺思路后重写才行）. So I don't agree with someone who a