1. I was unable to attend because of a previous engagement.
我因有约在先，无法出席。
《牛津词典》
2. He cannot go for he has a previous engagement.
他不能去，因他已先有约会。
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3. I am unable to attend because of a previous engagement.
我因有约在先故不能出席。
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4. 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。
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5. 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。
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6. 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。
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7. 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。
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8. 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。
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9. 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。
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10. 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。
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11. 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。
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12. I regret that a previousengagement 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。
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13. 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。
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14. Queen Elizabeth: We would love to, such a treat, but alas… a previousengagement. What a pity.
伊丽莎白王后：我们很乐意，盛情难却，不过……早有安排在先。甚为遗憾。
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15. I regret to say (that) I have a previous engagement that evening. However, thank you FOR thinking of me.
很遗憾，那天晚上我另有约会。不过，我还是感谢您想到了我。
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16. It is so thoughtful of you to ask me, but unfortunately I have a rather important previousengagement 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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17. It's very nice of you to ask, but I have a previous engagement that evening, so I'm afraid I won't is able to come.
你的邀宴太棒了，但那个晚上下班事先已有约会，所以我恐怕不能来参加。
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18. 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。
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19. Here "It" means the formalizing the process of re-using templates, design patterns or any other assets from IBM's previous successful customer engagement etc. in defining business process models.
