I was unable to attend because of a previous engagement.
我因有约在先，无法出席。
He cannot go for he has a previous engagement.
他不能去，因他已先有约会。
I am unable to attend because of a previous engagement.
我因有约在先故不能出席。
I'd love to, but I'm afraid I have a previous engagement.
我很宁愿答应往，但生怕已跟他人事前有约。
I can't see you on Monday because I have a previous engagement.
星期一我不能见你，因为我有约在先。
I cannot see you on Monday because I have a previous engagement.
星期一我不能和你见面，因为我有约在先了。
Sorry. I can't do lunch with you. I have a previous engagement. ;
抱歉，我无法和你去用午饭，我和别人有约在先。
I can't go with you to the concert because of a previous engagement.
我不能和你一块去音乐会，因为我已事先有约。
A previous engagement prevents me from accepting your kind invitation.
我因事前有了约会，不能接受您的盛情邀请。
It is very kind of you to invite me, but I have got a previous engagement.
谢谢你的盛情邀请，但我早已有约会。
Our manager has a previous engagement (appointment) at 4 'clock this afternoon.
我们经理在今天下午四点已经有预约了。
I regret that a previous engagement prevent me from accepting your kind invitation.
我很遗憾之前的约会使我不能接受你善意的邀请。
I am very sorry that a previous engagement prevents me from accepting your kind invitation.
很抱歉，因为我已另有约会不能接受你好意的邀请。
It is so thoughtful of you to ask me, but unfortunately I have a rather important previous engagement on that day.
您对我的邀请真是想得周到。但不巧的是，那一天我预先已有重要的约会。
It is so thoughtful of you to ask me, but unfortunately I have a rather important previous engagement on that day.
您对我的邀请真是想得周到。但不巧的是，那一天我预先已有重要的约会。
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