who knows!  天晓得! 

                
it is not a big deal!  没什么了不起! or... no big deal.

how come…  怎么回事，怎么搞的。

I'm not going to kid you.  我不是跟你开玩笑的。

    
easy does it.  慢慢来。or ...take it easy. 
　　

don't push me.  别逼我。

            
come on!  快点，振作起来!

That's something. 太好了，太棒了。

Brilliant idea!  这主意真棒！

have fun. 玩高兴些。

    
it is urgent.  有急事。
　　

what is the fuss?  吵什么?    

      
still up?  还没睡呀?

I'm broke.  我身无分文
　　

it doesn't matter.  没关系。

After you.  你先请。

Let's face it.  面对现实吧。 

 
don't let me down.  别让我失望。

god works.  上帝的安排。

           
don't take ill of me.  别生我气。
　　

hope so.  希望如此。   

             
go down to business.  言归正传。
　　

none of my business.  不关我事。  

  
it doesn't work.  不管用。

　　  
i'm not going.  我不去了。      

 
does it serve your purpose?  对你有用吗?

i don't care.  我不在乎。 

          
not so bad. 不错。
　　

no way!  不可能!   

                 
don't flatter me.  过奖了。
　　

your are welcome.  你太客气了。 

    
it is a long story.  一言难尽。

don't play possum!  别装蒜!   

      
make it up!  不记前嫌!
　　

watch you mouth. 注意言辞。

I just couldn"t help it. 我就是忍不住

Mind you!请注意！听着！(也可仅用Mind。)

Do you really mean it?  此话当真？

I've done my best.  我已尽力了。

Let's get started.  咱们开始干吧

Don't play games with me!  别跟我耍花招

how is your new job going?  你的新工作怎么样呢?

please come as quickly as you can.  请尽快来这。

how was your vacation?  你假期过得怎么样?

I'm happy to show you around． 我很乐意带你逛逛。