麻烦帮忙看一下这篇作文有没有语法错误，挑出错误加悬赏

麻烦帮忙看一下这篇作文有没有语法错误，挑出错误加悬赏
Friendship plays an important role in ourlife. But to me, Jack is what “friend” means to me. Jack is middle height,thin. However, he is always ready to do anything he can to help his friends.
Once a bike speed up so fast that the ridercan’t help himself when it hurts me. I injured pretty badly and I was not ableto walk. At this time, Jack rushed to me and, with a great power I have no ideawhere it come from, he carried me to the clinic! From his red face and heavy breathe,I know he pushed himself to help me.
From Jack I finally understand what “a friendin need is a friend indeed” means. I will always be ready to help others justlike him.
在线等，速来！