抱歉，这交际舞我有约在先了。
抱歉，这支舞我有约在先了。
我有约在先，恐怕不能与你共进晚餐。
I fear that a prior engagement will prohibit me from joining you in dinner.
星期一我不能见你，因为我有约在先。
I can't see you on Monday because I have a previous engagement.
对不起，我有约在先了。
对不起，我有约在先了。
星期一我不能和你见面，因为我有约在先了。
I cannot see you on Monday because I have a previous engagement.
谢谢你邀请我，不过我有约在先，但我还是谢谢你。
Thank you very much for asking, but I have a previous date, thank you just the same.
我因有约在先，无法出席。
由于有约在先，我不能接受下星期六与您共进晚餐的邀请，对此深表遗憾。
I sincerely regret that owing to a prior engagement I am obliged to decline your kind invitation to dinner next Saturday.
由于和别人有约在先，我不能参加晚会。
I was unable to attend the party because of a prior appointment.
我因有约在先故不能出席。
抱歉，我无法和你去用午饭，我和别人有约在先。
Sorry. I can't do lunch with you. I have a previous engagement. ;
李先生：很抱歉我不能参加下周六您和李夫人为您兄弟举行的晚宴，因为那天晚上我恰巧有约在先。
I am so sorry that I cannot come to the dinner you and Mrs. Lee are giving next Saturday for your brother because of a previous engagement that evening.
李先生：很抱歉我不能参加下周六您和李夫人为您兄弟举行的晚宴，因为那天晚上我恰巧有约在先。
I am so sorry that I cannot come to the dinner you and Mrs. Lee are giving next Saturday for your brother because of a previous engagement that evening.
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