This is before search and replace.

My name is Chrestopher , I am 16 years old and I come from Lancaster , England. I live at home with my family –my mother, my father, my brother and sister and my goldfish. I have lots of hobbies. I like football and swimming\, and I sometimes go fishing with my friends at the weekend. I am still at school. I am in the fifth year at a very big comprehensive school. There are about 2000 pupils there. I am not sure what I am going to do when I leave school.

This is after replacing I  with  He

His name is Chrestopher, He is 16 years old and He come from Lancaster, England. He live at home with my family –my mother, my father, my brother and sister and my goldfish. He have lots of hobbies. He like football and swimming, and He sometimes go  fishing with my friends at the weekend. He is still at school. He is in the fifth year at a very big comprehensive school. There are about 2000 pupils there. He is not sure what He is going to do when He leave school

This is after fixing up the verbs

 His name is Chrestopher , He is 16 years old and I comes from Lancaster , England. He lives at home with my family –my mother, my father, my brother and sister and my goldfish. He have lots of hobbies. He likes football and swimming\, and he sometimes goes fishing with my friends at the weekend. He is still at school. He is in the fifth year at a very big comprehensive school. There are about 2000 pupils there. He is not sure what He is going to do when He leave school.