How to politely ask someone to please be quiet There are particularly loud Chinese fellows working together in the university study room I'm working in. How do I politely ask them to quiet down?

I found a literal translation on Google Translate (能否请你安静), but I don't know if it has a rude connotation.
Well, avoid the exclamation mark.


  
  請保持安靜!
  Please keep quiet!  
  安靜!
  Quiet!
  小聲點!
  Lower your voice!
  請小聲點!
  Please lower your voice!
  


These from the above are a little commanding in tone, especially the second and third. You may change the tone by switching to a request rather than a command.

能否請你安靜 is relatively better. I usually go with this: 


  請問可以小聲點嗎? 謝謝。