On behalf of…, I have the honor to invite you to…
It is with the great pleasure that I write to cordially invite you to…
It gives me the greatest pleasure to invite you to…
We should be very grateful if you could…
There will be a dinner party to be held at the Beijing Hotel on Sunday, October 10th, at eight o’clock. Will you and Mrs. Smith come and join us?
I hope that you have no previous engagement and can join us for the English Evening at 7:00 p.m. on February 1st.
We are looking forward to seeing you
I do hope that you will be able to come.
We should be very pleased if you could honor us with your company.
Dear Mr. Williams,
I am writing on behalf of （代表） the English Department to invite you to give a lecture in our college.
We know that you are an expert on American literature. As English majors, our students would like to know something about American literature. We would be very gratefulf （感激） if you could give a talk on “Contemporary American Literature” to students of the English Department on Saturday, June 4. If this subject does not suit you, any other similar topic would be welcomed as well.
We have already had several very interesting talks from some distinguished （尊贵的，知名的） visitors from various countries and we look forward early to the opportunity to benefit from your experience and wisdom.