Sprawdzicie ?

Bardzo będę wdzieczna za poprawę błędów .
Dear Michael,

I am writing to apologise for not going your birthday party on Sunday. You can’t imagine had bad I feel. I would write to you to tell you why I didn’t come.

On Sunday morning my sister feel ill. She have terrible stomachache. I must with my sister leave to the doctor. The doctor says that she is ill (grypa żołątkowa) so my sister must stay in the bad at all time. I must with she stay in our home and care for her. That is why I going to your birthday party.

I hope you belive me I tell you how really sorry I am. Please let me to inviting you on a film “Nienarodzony” in the cinema next Sunday evening. Tickets on me. What do you think ??

Love,
xyz

I am writing to apologise for not going TO your birthday party on Sunday. You can't imagine had badLY I feel. I THOUGHT I would write to you to tell you why I didn't come.

On Sunday morning my sister feel (zly czas) ill. She have (zly czas) A terrible stomachache. I HAD TO GO [with my sister to the doctor...kol slow]. The doctor says (zly czas) that she is ill with THE STOMAUCH FLU so my sister must stay in bad [at all time...nie potr]. I must [with HER stay...kol slow] in our home and care for her. That is why I COULDN'T GO to your birthday party.

I hope THAT you belive (orto) me WHEN I tell you how really sorry I am. Please let me (apologise? albo make it up to you?) BY inviting you TO THE film “Nienarodzony" next Sunday evening. THE tickets ARE on me. What do you think ??