Much is a quantifier. It comes before the noun, like other quantifying determiners (Few, some, little). "Much" is always used with uncountable nouns (much work, much snow, etc.). "Many" is always used with countable nouns (many cars, firends, etc.). 1.You are the best student whom I have met. Others don't have as many skills as you have. In this sentence, "skills" is a countable noun. The quantifier comes before the noun. 2. She doesn't have as much money as you have. In this sentence, money is not a countable noun. The quantifier come before the noun. 3.Our country is not developed as much as you think. Much is modifying developed 4.She can't sing as much as you. Much is modifying sing Much in 3 and 4 are adverbs. The structure is used to compare things of similar proportions. The structure is: "as...as" Other examples: She is as tall as you. You can eat as much as you want.

Hey Javi! Both 'as much as' (used for uncountable nouns) and 'as many as' (used for countable nouns) have the same meaning which is 'up to or equal to a certain number or amount'. I shall now rewrite your sentences: 1) You are the best student whom I have ever met. Others do not have as many skills as you have. 2) She does not have as much money as you have. 3) Our country is not developed as much as you think. 4) She can not sing as much as you (can). Hope that helps!!!