Correçao de Essay: Bullying at schools

This is the first time i've written an essay in this forum if I not mistaken and hope someone can help me make it better by adding some synonyms.

Bullying is a worldwide problem that occurs most of the time at schools and also in public enviroments. It's characterized by the use of force, threats, sex hassaraments,intimidation, coercion and so on. There are four types of bullying such as cyberbullying,verbal, emotional and phisycal which is the worst way of abusing a victim in my point of view and more often than not is done by a group which is known as mobbing in order to assist the bully with his/her bullying activities.The causes of bullying activities may include some differences of social class, size, religion, appearace, reputation, etc. As for signs of bullying suffered by the victim, is change in his/ her behaviour, anxiety, irratability, unwillingness to go to school, these are according to some parents depoiments the main signs seen.One thing that parents need to keep in mind is that the teachers are not the ones to blame for their child being suffering bullying, it's both parents' role and schoolto make sure their children are ok and are not getting into trouble. In my opinion,the most effective way to prevent and lessen bullying is the increase of safety at schools.

Looking forward to seeing from you guys what I can do to improve it.