英语短文改错题：用有10处错误！帮忙改一下！
one rainy day while i was walling home with my friend,a truck came to a stop besides me.The driver put the window down and offered us a umbrella because he found we were wet through.i stood there and couldn't believe in that a complete stranger is so thoughtful.The man insisted,so i grateful accepted the offer,thanked him and watched the truck disappear down the road.this man might need the umbrella himself,and he preferred to give it to everyone else.it was a lesson to us and was possible give without expect anything in return.急死了！快点啊！