求帮忙看一下小弟的英语作文,有什么语法,用词错误的请指示修改下.3Q,最后一篇求帮忙作文了.

求帮忙看一下小弟的英语作文,有什么语法,用词错误的请指示修改下.3Q,最后一篇求帮忙作文了.
Dear Dr’Smith ,
I’m Liming,chairman of the University union.
The annual foreign language festival is about to begain .I’m writing this letter on behalf of the Student Union,inviting you to attend the opening ceremony of the Foreign Language Festival ,an annual event at this university ,and give a speech at the ceremony.
The theme of this year’s Foreign Language Festival is crossing the cultural gap and I believe your presence and speech at the opening ceremony will give us the best example of cross culture communication .I consider it a great honor if you could come to the event.
I’m looking forward to your early reply.
Sincerely
L