I'm good,thank you!
不用了，谢谢！（这个很万能。I'm good除了表示“我很好”，还可以表示“不用了”）
Sorry,but that's not really something I can do.
抱歉，但我真的无能为力。（心有余而力不足）
I can't right now,but maybe later.
现在不行，晚些时候或许可以。
I can’t at that time, but I’m happy to help you with something else later.
那时候不行，不过以后有事我很乐意帮你。
That sounds very nice,but...
听起来很不错，但是……
I'm really sorry about that...
对此我真的很抱歉
Thanks for asking, but.
感谢你邀请我，但是…
Actually, I already made plans.
其实，我有事了。
I’m sorry, but I have an emergency to attend to.
对不起，我有个急事要处理。
I see where you’re coming from, but…
我能理解你的意思，但是…
I’m afraid I’m committed to something else.
恐怕我有别的事要做。
I’m sure you will do fine on your own.
我相信你自己会做好的。
Sorry but that isn’t my strong suit.
对不起，那不是我的强项。
I’m sorry I can’t.
对不起，我不能。
I’m afraid I can’t.
恐怕不行。
Unfortunately, I’ve had a few things come up.
不幸的是，我有一些事情要处理。
I’m trying to focus on finishing off some other things.
我想集中精力完成一些其他的事情。
- I’m sorry, but …
Q: Would you like to have a dinner with me?
你愿意和我一起吃饭吗?
A: I’m sorry, but I have got a date tonight.
对不起，我今晚有约会了。
- I would love to, but …
Q: Would you like to get a drink tonight?
你今晚想喝一杯吗？
A: I would love to, but I need to work overtime.
我很想去，但我需要加班。
- That sounds good, but …
Q: Would you like to join our camping next week?
你愿意参加我们下周的野营吗？
A: That’s sounds good, I am busy with my assignments.
听起来不错，但我正忙着我的作业呢。
- I wish I could, but …
Q: Would you like to enroll this course together?
你愿意一起报名参加这个课程吗?
A: I wish I could, but my schedule is already too full.
我希望我能去，但是我的日程已经排满了。
- No, thank you.
Q: Do you want a cup of tea?
你想喝杯茶吗?
A: No, thank you.
不用了，谢谢。
- It’s very kind of you, but…
Q: Would you like me to drive you home?
要我开车送你回家吗?
A: It’s very kind of you, but I’ve already got a lift.
非常感谢您（你真好），但我已经搭便车了。
- I appreciate the offer, but …
Q: Would you like me to finish the report for you?
你想让我帮你完成这份报告吗?
A: I appreciate the offer, but I think I can do it in time.
我很感激你的提议，但我想我能及时完成。
- It’s very tempting, but …
Q: Would you like another piece of cake?
你要不要再来一块蛋糕？
A: It’s very tempting, but I can’t
这很诱人，但我不能
- I really shouldn’t.
Q: Stay for another drink!
留下来再喝一杯!
A: I really shouldn’t! I’ve got to get up early tomorrow.
我真的不应该!我明天得早起。
- I can’t this time.
Q: Would you like to come to the pub after work?
下班后你愿意来酒吧吗？
A: Oh, I can’t this time. I promised I’d pick up Joe from school.
哦，这次不行。我答应过我会去学校接乔的。
Q: Can you check my report for me?
你能帮我检查一下我的报告吗?
A: I’m really sorry, but I can’t this time. I’ve got to finish something urgently.
真的很抱歉，这次不行。我有急事要办。
- It’s a great offer, but …
Q: …. and this phone has the latest camera and…
…这款手机配备了最新的摄像头，并且…
A: It’s a great offer, but I’m not interested.
这是一个很好的报价，但我不感兴趣。
- Actually, I think I’m going to pass on it, if you don’t mind.
Q: We could also arrange five monthly payments…
我们还可以安排五个月的付款…
A: Actually, I think I’m going to pass on it, if you don’t mind.
事实上，如果你不介意的话，我想我就不提了。
Q: Would you like to come out for a curry? We’re all going…
你想出来吃点咖喱吗?我们都要去…
A: Actually, I think I’ll pass on it tonight. I’m really tired.
事实上，我想我今晚就不去了。我真的很累。
- Let me sleep on it.
Q: I’m not sure if I can offer you a full-time position. Would you consider a part-time role instead?
我不确定能否给你一个全职的职位。你会考虑做兼职吗？
A: Oh – let me sleep on it!
哦，让我考虑一下!
Q: We can offer you a 10% discount if you pay the deposit before next week.
如果你在下周前预付定金，我们可以给你10%的折扣。
A: OK – let me sleep on it.
好吧——让我考虑一下
Q: Do you want to be involved in the project?
你想参与这个项目吗？
A: I’m not sure. Let me sleep on it.
我不确定。让我考虑一下。
- Can you give me a couple of minutes?
Q: Can I interest you in our top-of-the-range dishwasher?
您对我们高档的洗碗机感兴趣吗?
A: Oh – can you give me a couple of minutes?
哦，你能给我几分钟时间吗?
- Not today, thanks.
Q: Are you looking for a great takeaway?
你在找好吃的外卖吗?
A: Oh, not today thanks.
哦，今天不行，谢谢。
（想象一下，当你走在街上，有人想给你发传单的时候）
内容参考：
https://www.wallstreet.edu.hk/web/10135/conversation/how-to-reject-people-politely-5-ways-to-say-no-in-english/?lang=en#.X0ZON_mWbDc
https://www.english-at-home.com/refuse-an-offer/#
