Your boss just assigned a new project to you and you can't imagine how you'll get it done. Can you say no to your boss, though? You can if your reasons are good. Now, you have to decide if they are. First here are some questions you can ask yourself to help you decide. Following that are bad reasons to say no, and then good reasons. Then once you've made up your mind, there's advice on how to present your decision to your boss.
上司刚刚给你分配了一个新任务，但是你不知道如何去完成。那么，你可以跟老板说不吗？其实是可以的，只要你的理由充分合理。现在，你就要想想该用什么理由了。考虑之前，先回答下面这些问题，然后再判断理由是否合理。当你下定了决心，便浏览一下下面这些建议，知道如何表达自己的诉求。

Questions to Ask Yourself Before You Decide to Say No to Your Boss
拒绝老板之前要问自己的问题？

Am I already working on several important assignments that leave me no time for this one?
因为太多任务所以无法完成这项任务了？

Can I delegate some of my other work to make room for this assignment?
可不可以寻求其他同事找时间帮忙完成这项任务？

Can I put some of my other assignments on the back burner while I work on this one?
我能否把其他任务搁置，先完成这项任务？

Will taking on this assignment cause harm to my other work?
接受这项任务会不会对其他的工作造成不良影响？

Do I absolutely lack the skills necessary to complete this assignment?
我真的缺乏完成这项任务的能力吗？

Am I the only person who can successfully complete this assignment?
只有我才能顺利完成这项任务吗？

Bad Reasons To Say No to Your Boss
这些理由不能用

Turning down an assignment from your boss is not something you should do on a whim. While the reasons listed here may seem important to you, they probably aren't good enough for your boss.
拒绝上司给你的任务并不是你心血来潮的时候想做的事情。虽然下面这些理由对你来说有一定的作用，但并不是好的理由。

The project looks too difficult.
这个项目看起来太困难了。

It isn't part of my job description.
这不是我工作范围内的事情。

I'm in the middle of planning my wedding and can't focus on anything right now.
我正在筹备我的婚礼，无法抽空关注别的事情。
Good Reasons to Say No to Your Boss
这些理由可以用

Though you should give an assignment careful consideration before you turn it down, if your boss is fairly reasonable, he or she should be able to understand these reasons.
在准备拒绝老板的任务之前你应该深思熟虑，如果你的上司是个通情达理的人，他/她会理解你的。

There simply aren't enough hours in a day to work on it, even if I get to work early and stay late.
尽管我已经早出晚归了，但是一天的工作时间还是不够用。

My other work will suffer if I take on this assignment.
如果我完成任务，其他的任务就会受到影响了。

I don't have the necessary skills to complete this project and I will not be able to attain them in time.
我没有足够应付这份任务的能力，所以我不能及时完成它。
How to Say No to Your Boss
怎么说？

If you decide to turn down an assignment, be prepared to offer a good reason for doing so. You will have to explain your reasons thoroughly so your boss realizes you considered the situation carefully. Give your boss ample warning so he or she has enough time to assign the work to someone else or can help you delegate some of your other projects to one of your co-workers so you can work on this one.
如果你决定了拒绝一项任务，那么就准备好拒绝的理由吧。你要认真详细地给上司解释你为什么无法接受这份任务，这样上司才能很好地了解你的情况。给予上司足够的提醒，他/她就能够有足够的时间把任务分配给其他人去完成了，或者让其他人帮助你完成你的其他任务，让你有时间完成这项任务。

If your reason for saying no to your boss is that you don't have enough time to work on the project, prepare a list of the other projects on which you're working. If he didn't delegate the other assignments to you, he may not even be aware of them. If he did assign the other projects, he may want you to work on the new one instead.
如果你的理由是时间不够，那就准备一份清单，把你要完成的任务列在上面。如果他没有给你分配其他的任务，他有可能不会注意到这些。如果他的确给你分配了其他任务，他就很有可能让你先完成这一个任务了。

If you think your other work will suffer if you take on another assignment, explain that to your boss. She will appreciate your honesty and your dedication to your other projects.
如果你认为这项任务会影响到其他任务的时候，跟你的上司解释情况吧。她会欣赏你的坦诚和你对工作的热诚的。

If you don't have the necessary skills to complete this assignment, admit this to your boss. It would be worse to pretend you can do something you can't. Ask him if future assignments will require this skill. If his answer is "yes," let him know you will work to attain it.
如果你没有足够的技能胜任这份任务，就跟你的上司坦诚吧。如果你不这样做的话，就有可能让事情变得更糟糕。询问他以后的任务会否需要这样的技能。如果他的答案是"yes"，那就让他知道你会努力学会获得这种技能的。

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