急求英语作文：it's our duty to help the people in troble

It's Our Duty to Help the People in Trouble
The society is just like a big family,it has many many members,living and working together.Hower,we can not do all the jobs by ourselves and we usually have some trouble.So we need a help,and it's necessary to help others in troube,for to help others is to help ourselves.Two years ago,when I was on my way to school,I got hurt on my foot.I couldn't move.I was very sad.Suddenly Liu Dong,my classmate appeared and took me to the hospital..Thanks to his help,I recovered soon.Then,not long later,Liu Dong had difficulty with his maths.When I knew about that,I helped him.
Friends,it's our duty to help the people in trouble,for you may need a help someday.