In short, it can be said that
Dear ,
Much to my regret / I amterribly sorry that I am unable to . It is mainly because at that timeI will be full occupied by which is quite out of my expectation, and thatconflicts with your .Therefore I am forced to adjust my schedule and cannot make my presence on your . I sincerely hope thatyou will enjoy a good time. By the way, can we have dinner together some timenext week? I hope to see you soon.
I am really sorry againand I trust that you will understand.
Yours sincerely,
Li Ming
1 A good case in point is ...
2 As an illustration, we may take ...
3 Such examples might be given easily.
4 ...is often cited as an example.
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