You arranged to visit a friend in Canada but an important event at home now means that you must change the dates of the visit. Write a letter to your friend. In your letter

Dear Mary, I hope you are safe and sound! I am writing this letter to you that I let you know I can not go yours. I have been looking forward to visiting Canada and spending time together. But I have had an urgent problem. My sister is leaving for Moscow due to her work, […]