☆I'm afraid I can't.我恐怕不能去。
☆Thank you，but I'm afraid I have other plans for that night.谢谢，但是恐怕我那天晚上有别的事。
☆I'm sorry.I can't go to the movie with you.很抱歉，我不能跟你去看电影。
☆I wish I could，but I'm busy.Maybe another time.我希望我能去，可是我太忙了。要不下一次吧。
☆I hate to turn you down，but I must...真不愿意拒绝你，但是我必须......
☆I would like/love to any another time，but I've already made plans.以后有机会我很愿意，但这一次我已经有安排了。
☆Thanks for asking，but...谢谢你来问我，但是......
☆I appreciate your invitation，but I'm afraid I can't.谢谢你的邀请，但是恐怕我不行。
☆I'm afraid I can't，but thanks anyway.恐怕不行，但还是谢谢你。
☆I'm tied up that day/night.What about another time？那天/晚上我有事儿。改日吧。
A：We're having a Christmas party at my home next Friday.Do you think you can come？
B：I'm sorry.I can't come，because our company has a party，too，next Friday.Thank you for asking me.
A：No problem.Maybe next time.
A：I'm calling to see if you would like to have lunch tomorrow.
B：I'm sorry，but this week isn't very convenient for me.
A：Perhaps we can make it later.
B：That would be better.
A：Are you free next Saturday？
B：I'm not sure about it.I'll have to check.What for？
A：We're going to have a picnic in the suburb.
B：Oh，I'm sorry I've already made plans and it's too late to change it.Why didn't you tell me earlier.
A：Hello，Miss Huang.How are you？
B：Hello，Wang.I'm fine，and you？
A：I'm doing fine，too.Well，Miss Huang，we are planning to have a casual get-together and I wonder if you and your husband can join us.
B：That sounds very nice.When will it be？
A：It's next week from this Monday.
B：What a pity！We have another party that day.How I wish we could come！
A：It doesn't matter.Let's wait until next time.
A：Hi.Jill is speaking.
B：This is Sam.How are things with you，Jill？
A：I'm very well，but very busy.
B：But you've finished your exams，haven't you？
A：Yes，but I've got a lot of things to do.
B：How about coming out with me this evening？
A：I'm sorry，I can't.I've promised to meet a friend.
B：What about the weekend？Are you free then？
A：No，I'm sorry.I've arranged to go to Paris this weekend.
B：But I must see you！What about next week some time？
A：I don't know.I've got so many things to do.
A：I have to hang up now.Someone wants to use the phone.Goodbye.