About the "difference"
I need to know which one is correct as below:

1) There are many differences between.......

2) There is not much difference between....

3) There is much difference between.... ( or maybe it is better with " so much difference")

The word "difference" is a countable noun as well as uncountable noun, right?

I also have problem to define which is countable noun and which is not... how to figure them out?

Question

About the "difference"
I need to know which one is correct as below:

1) There are many differences between.......

2) There is not much difference between....

3) There is much difference between.... ( or maybe it is better with " so much difference")

The word "difference" is a countable noun as well as uncountable noun, right?

I also have problem to define which is countable noun and which is not... how to figure them out?

Answer

I need to know which one is correct as below:

1) There are many differences between.......
（这里“不同”指的是（意见的）分歧，不和）
2) There is not much difference between....
(我认为这里的“不同”指的是差别，差异）

3) There is much difference between.... ( or maybe it is better with " so much difference")

The word "difference" is a countable noun as well as uncountable noun, right?

总之要看具体的语境
这里供你参考： http://dict.baidu.com/s?wd=difference