Question : Write a letter to your friend to invite him on your elder sister marriage ceremony.
Answare :

My dear (friend name),

At first take my love. Hope you are well by the grace of Allah. I am also well. You will be very glad to know that the marriage ceremony of my elder sister come on next friday. I invite you to attend the ceremony. Your presence will give me much pleasure and my parents will also happy to see you. I hope you will come to our house on that day.

No more today. with best regards to you and your parents and love to youngers.

Your loving Friend,
( Your Name )