Dear Elena,
How are you doing? I got your letter.
Thank you so much for your invitation. It was really nice. I was very happy when I got a letter from you.
I asked my mom if I could go with your family,but unfortenely she said no!! She told me that I have to help her with house cleaning and then look after my beautiful,funny little sister. My Dad told me to also cook lunch to my sister.
But we can do it another time,right? I am free on Sunday,then we can do something incredible,awesome things,like skydiving. My parents allowed me to do that. We'll pay for you, that will prove that we are sorry.
Write to me as soon you'll know.
Love,Anna