求一篇英语作文写法.假如你是约翰.元旦即将来临,同学邀请你去参加元旦晚会,但是由于你们全家人已经决定去香港旅游,因此你不

Dear friend,
Thanks very much for your invitation,i would be very glad to join in you,but i am really sorry that i may not be able to make it since my families have decided to have a trip to Hongkong during the holiday.The flight has been booked already.
Really appreciate for your invitation and wish you have a good time and enjoy the New Year's party!
All the best,
John.

首先你写，你是非常乐意跟他们去元旦晚会的，然后转折一下说你有事去旅游了，所以很遗憾不能去了，然后就希望他们在晚会上玩的开心什么的，留些照片给你看什么的。就这样

Dear Freinds,
Thank you so much for inviting me to the new year's evening party,I really want to join you guys,but my family has decided to visit Hongkong during the vacation,so I'm afrai...

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注意am is are