do boys know how to cry???

Of course. I've seen my son's father cry many times - and he's 22 years old. Maybe you are just more comfortable in your masculinity than most men. ;)

Until recently boys were not allowed to cry, in public anyway, it was considered to be weak, well thank heavens that is changing, if the emotions are there express them.

Why not. Boys are human too. Unless we totally don't have emotion, then we don't cry. Man cried when he is in his saddest moments. The tears of men are sometimes very saddening, even more saddening than women... I cried the most in my life when my gf left me few weeks back. I am still sad now, but i no longer crying anymore.

boys cry are normally. it seem fell their feeling. I think if I am see boys cry maybe they have a big problem and can't solved easily. But if boys weak, and every have problem, he is crying, it is so strange.