Dear Bob,
I am very sorry to tell you that I can't go to the book store with you this afternoon, because I have to join the debate on behalf of my class. Last week I had been told that I would take part in the debate for my class this Saturday, but I forgot it totally and told you I would go to the book store with you today. I am very sorry for this, and hope you can understand me. We can go to the book store together next time.
best wishes.
yours, Li hua
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