Sprawdzenie listu

Proszę o sprawdzenie listu i poprawienie błędów oraz przetlumaczenie ostatniego zdania.

Dear Ann,

Thanks a lot for your letter. I hope you are well.
I’ m sorry I haven’t written to you for a such a long time. I’ ve been very busy. I started secondary school in new town, therefore I come back home rather late, so I haven’t many free time.
I writing to you, because I want to tell you what happened to me on my way back home. When I was going to railway station after school suddenly I saw two men. They was going for walk with a big beautiful dog. At first glance I knew it’s a American Staffordshire Terrier, so I couldn’t indifferently pass by him. I approached to them and I inquired did I stroke the dog. The owner’s dog agreed to it. I was very happy and glad. Waiting for train we were talking about dogs. That men proved very funny and likeable. Thanks to this unusual story I made new friends.
I was so sad to heat that you are having problem in school. Pamiętaj że zawsze możesz liczyc na moją pomoc.

Take care
Your sincere friend
Lena

I started secondary school in A new town, therefore I come back home rather late, so I haven't 'many' MUCH free time.
I AM writing to you, because I want to tell you what happened to me on my
way back home. When I was going toWARDS (albo near a) railway station after school suddenly I saw two men. They 'was' (ale 'they' odnosi sie do l. mnogiej, potrzebuje czasown l. mn - WERE) going for A walk with a big beautiful
dog. At first glance I knew 'it's' (lepiej IT WAS) a American Staffordshire Terrier, so I couldn't indifferently pass by him. I approached 'to' (niepotr) them and I inquired IF I COULD 'did I' (niepotr) stroke the dog. Waiting for THE train we were talking about dogs.
'That' THOSE men proved very funny and likeable. Thanks to this unusual 'story' (lepiej EVENT) I made new friends.
I was so sad to 'heat' HEAR that you are having problem in school.
Pamiętaj że zawsze możesz liczyc na moją pomoc- Remember that you can always count on my help.