Good News

「這是一個好消息」的英文是什麼呢？ 

This is a piece of good news. 

千萬不要說：This is a good news. 

正如 "advice"，"meat"，"music"，"cloth" 等等，"news" 是一個不可數名詞 (uncountable noun)，單一數量必須用 "a piece of" 來修飾： 

He's told me a piece of good news. (correct)
He's told me a good news. (wrong!)

Let me give you a piece of advice. (correct)
Let me give you an advice. (wrong!) 

There's a piece of meat on the plate. (correct)
There's a meat on the plate. (wrong!) 

You should clean it with a piece of cloth. (correct)
You should clean it with a cloth. (wrong!)