Write a letter of about 80 words to a friend accepting an invitation to go with him to an exhibitioaccepting 在句子做什么成分,accepting的主语是谁.怎么分析这个句子.

这个句子就是说“给一个朋友写一封80字的信表示你接受邀请去参加展出。”
accepting 在这里就只是指“接受”这一动作，可当作名词。
你需要我写一篇给你吗？如果需要的话请继续看：
Dear Jim:
Thank you so much for inviting me to the exhibition of Ancient Egyptian Arts in the City Museum. Yes, I will definitely go. I am so excited that I will be able to see the mummies and the treasures of the Pharaohs; you know that I have always been fascinated by these. So, according to your schedule, I will meet you at one o’clock in the afternoon in front of the museum on Sunday. Don’t worry, I’ll be there on time. Thanks again for inviting me.
Love,
Beryl

1、accepting做什么成分
“accepting an invitation to go with him.”这一整块都是accept的动词ing形式作宾语补足语.整个句子中,letter是宾语,“accepting……”是对letter的进一步阐述,因此accepting是宾语补足语.
2、accepting主语是谁
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