哪位大神帮我看看这篇英语作文有没有错误?

哪位大神帮我看看这篇英语作文有没有错误?
Hi,my name is Helen Smith and I'm fourteen years old.I'm a student in the Class1 Grade7.My favourite colour is green and my favourite subject is English.I like swimming,sometimes I go swimming on Sunday,so my favourite day is Sunday.I have a nice family——My father,my mother,my brother and me.My father is an actor and my mother is a science teacher.My brother is a policeman,he work at a police station.And you?