Don't attempt more than you are capable of. 
这事做起来没有太大价值。 
There isn't much merit in doing so.
There is no reason to do so.
I don't see the point (of doing that). 
你还得再加把劲儿。
What you need is a little more effort. *effort “努力”、“尽力”。
You should put a little more effort into it. (你应该再加一把劲儿。)
You should try a little harder. (你应该再努力一点儿。) 
有点自尊心吧! 
Respect yourself. 来源：考试大
我希望你事事要积极。
I hope you'll be more positive overall. *positive “积极的”。
I don't think I can do it. (我觉得我做不了。)
I hope you'll be more positive overall. (我希望你事事要积极。)
I hope you'll be more positive in every way.
I wish you'd be more positive.
You should be more optimistic. (希望你能乐观点儿。) *optimistic “积极的”、“乐天派的”。 
你说得容易。 
That's easy for you to say.
If you practice hard, you'll get a gold medal. (如果你刻苦练习，一定能够得金牌。)
That's easy for you to say. (你说得容易。) 
你发什么牢骚? 
There's no reason for complaints. *complaint “不满”、“抱怨”、“诉苦”。
There is no reason to complain.
There is nothing to complain about. 来源：考试大
你脸上都写着呢呀! 
It's written all over your face.
Did you pass the exam? (考试都通过了?)
How did you know? (你怎么知道的?)
It's written all over your face. (你脸上都写着呢呀!)
It's obvious. (明显地能看出来。) *obvious “一眼就能看出来的，明显的”。
I can see it in your eyes. *你的眼睛告诉了我。 
我当然会生气了。
It's natural for me to get angry. *It's natural for...to “当然(自然)会”。
Why shouldn't I be angry?
I have a right to be upset!
My reaction is completely appropriate. (我这样的反应是自然的。) *appropriate “与目的、条件等相称的，适合的，恰当的”。 
我是根据我的经验才这样说的。 
I'm telling you this from my experience.
Are you sure about it? (确实是这样吗?)
I'm telling you this from my experience. (我是根据我的经验才这样说的。)
Let me offer you some advice. From my experience... (我给你一个建议，据我的经验来看……) 
没其他不同的看法吗? 
Can't you think of it differently?
Can't you look at it another way?
Can't you think of it in a different way? 
好好想想。 
Just think of it!
Just fancy. *有点过时的表达方式。
Just imagine. (想像一下。) 
不要轻信。 来源：考试大
Don't trust it. *“不要轻率地相信对方的话，别轻信”。
The newspapers say that the yen will go up soon. (报纸上说，日元马上就会升值。)
Don't trust it. (别轻信!)
Be cautious. (请慎重。)
Be careful. (要多加小心。)
Trust it. (请相信。) 
我是个容易上当的人。
I'm so gullible. *gullible “易受骗的，轻信的，太老实的”。 
别小看他。 
Don't underestimate him. *underestimate “过于轻视”、“小看”。
We don't need to worry about him. (我们不必担心他。)
Don't underestimate him. (别小看他的能力。）
You shouldn't underestimate his abilities. (你不该小看他的能力。)
He is better than you think. (他比你想像的要好。) 来源：考试大
那是最重要的呀! 
That's the name of the game. 
我不能对你特殊。
I can't make any exceptions for you. *exception “除去……”、“……除外”。
We can't give you any special treatment.
I can't make an exception for you. 
动动脑子。 
Use your head!
I don't know how to do it. (我不知道怎么做。)
Use your head! You can do it. (动动脑子，你能做到的。) 
自作自受。 来源：考试大
You asked for it! *直译是“那是你追求的”。常用短语“自作自受，活该”。
My boss scolded me today. (今天被老板训斥了一顿。)
You asked for it! You didn't finish your report on time again. (自作自受，你又没有按时交报告。) 
如果批评得对，你就接受吧。 来源：考试大
If the shoe fits, wear it. *直译是“如果鞋合适，你就穿上它”，表示“如果认为别人批评得有道理，就该接受”。
My boss criticized my sloppy personal appearance. (我的老板批评我穿得邋遢。)
Well, if the shoe fits, wear it. (如果批评得对，你就接受吧。)