It is much, much有可能表示“... 得多”，后面加形容词比较级，如It is much bigger (than this one).
There is much, much表示“许多”，后面加不可数名词，如There is much water.
It is much heavier. much+比较级。 much 副词，----的多
There is much water on the floor. much+不可数名词。much 形容词，许多---
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