I think friends are:

Always right by your side;

Always listen to you;

Always concentrate and be serious and promise;

If you are sad, he will be sad too;

Always stand beside you and look after you;

And he will stand right next you and believe you...

Have you got a friend like this?

If you have, I really congratulations you; If you haven't, try to find someone around you.

Try to find a true friend...