have a good time 为什么加a?nice weather前面却不能加a?

have a good time为什么加a have a good time 其中time不可数为什么加a? have a good time. have a good time what a good time we have还是what good time we have为什么 have a good time能改成have good time么 为什么 have a good time 同义词 have a good time 用法 have a good time 急用 we have a good time! have a good time翻译 Have a good time every They have a good time.( I have a good time Have a good time,every Have a good time= have a good time=have a good day? have a fun time等于have a good time吗