There are many criteria to form a special friendship among people, and we need to make sure we are always good friends. First, two people need trust to be friends. If we do not believe in each other, we will never have a safe feeling when we are with him or her. Second, understanding is an important factor that pulls people closer. We always need at least one person to understand our feelings, therefore they can share and encourage us when we have a problem. Third, we should be loyal to our friends. It is not that we are their servants or we have to follow their orders, but we have to make sure that we will never betray them. Betrayal can create a deep wound that will never heal, and true friends never stab in the back of the others. The last thing is we need to sympathize with our friends, and make sure that we can be with them when they need us. Being a good friend seems to be hard, but we can easily do it when we have true feeling from the bottom of our hearts