449. But unfortunately I expect guests myself on...; and therefore cannot accept your invitation for...on that day.
译文但是很不凑巧，在……我自己要招待客人，因此就不能接受您那天……的邀请了。
点睛本句型常用在回复邀请信件中，适用于拒绝邀请的情况。常常是在表达了对邀请人的感谢之后接此句，因此句首使用了表示转折的but。其中，介词on后面应接具体的日期或者星期；介词for后面应该接名词。
句型拓展However, I am in hospital and probably will be still in bed that day, hence cannot attend the meeting. 可是，我正在住院，而且很可能那天还在卧床，因此不能参加那个会议了。
Unfortunately, I have made an appointment with Mary that day. 很不巧，我已经跟玛丽约好了那天见面。
