当我问候你：“你吃饭了吗”？你是不是很困惑？是该回答“我没有吃饭”，还是“我不吃饭”？下面ruby老师给大家解下疑惑：

1. For expressing "don't have" and "there isn't or there aren't", you must use "méi yǒu" or "méi ". You can not use "bù". "méi "is the shorter term for "méi yǒu", usually you can replace each other.
    For example:
      我没有时间。 .

      我没有钱。

      我没空。
      英国没有大熊猫 。
 
2. "bu" is usually used to describe the change of the state of something, but "mei" is usually to describe a negative fact.
   车不走了。(The car was going before, but now it is not going any longer.)
   车没走。（The car is there. It hasn't gone yet.）
   天不下雨了。(It was raining before, but now it is not raining any longer.)
   天没下雨。(It hasn't rained. It didn't rain.)
   

so the answer is :1.我没有吃饭。（to describe the fact，it is objective）

                          2.我不吃早饭。（maybe i don't lile to eat .it's subjective.）
 你看懂了吗？