ps：感覺就是一般英文信的寫法。
第二種：
ps：相當正式的官方邀請函。
第三種：
letter of invitation
dear sirs/madam:
we hereby sincerely invite you and your company representatives to visit our booth at the continental exhibition center from april 15th to 20th XX.
we're one of the manufacturers specialized in sanitaryware, concluding one & two piece toilet, wash basin, cabinet basin, pedestal basin, bidet, urinal, counter basin , decorated ceramics and so on. our new models offer superb design and their new features give them distinct advantages over similar products from other manufacturers.
it would be a great pleasure to meet you at the exhibition.we expect to establish long-term business relations with your company in future.
exhibition center : the continental exhibition center
booth number : g-k105 g-k-106
date : apr 15th to 20th XX
best regards,
mr.su jia jian
general manager
ps:本人認為，這種很有可能是對的。
第四種：
a formal visa invitation格式
公司抬頭
to
＊＊＊＊＊＊＊＊＊
attention: ＊＊＊＊＊＊
a formal visa invitation
dear sir or madam:
we are very pleased to invite mr. ＊＊＊ come to our factory for visiting and business negotiation. the business trip will start from 18th april XX . and because the long business co-operation in future between ＊＊對方公司名 and us, they will come to china for many times.
please note, however, that we don’t assume any legal or financial responsibility whatever regarding the presence of ****** in china. all expenses of ＊＊＊＊＊’ｓjourney to/from china, their stay in china as well as health insurance will be borne by their employers.
we send you our kindest regards and best wishes for a pleasant trip.
yours sincerely,
signature
general manager
ps:沒太看明白，是怎么回事