At school, fights sometimes happen. But how to keep away from (they)? Here's something you can do.
Be calm. Sometimes, you feel angry that you really want to teach somebody a lesson. But being angry can't solve problems. Neither can a fight. In fact, everyone in a fight should (punish), no matter who started it. There is no (win) in a fight.
Shout loudly. Turn towards the person is coming up behind to attack (攻击) you, put both your (hand) up in front of your body and loudly say "stop". If the person doesn't stop, ask help by calling out the name of a teacher whose office is nearby.
Learn to refuse. Your friend may ask you (join) in a fight. Learn to say no. Helping him fight is not (help) at all. If you really want to give him a hand, tell him to give it up. Tell him if he gets into a fight, he may get hurt (easy). Then, try to learn why he wants a fight and help him find a right way to deal with the problem.