Can someone explain when to use many and much in a sentence ?
Many is used to describe countable nouns, i.e, nouns that can be pointed out and be counted. For example, many shoes, many ships. The immediate question that arises after this would be, How are stars countable? We refer to stars as many stars. The answer is that although stars are not finite, we can still count stars by pointing out them.
Example sentence: How many cars can this parking lot accommodate?
Much is used to describe uncountable nouns, i.e, nouns that cannot be singled out or counted as separate entities. For example, much rice, much juice, much water. These nouns are considered single entities and can only be defined by their quantitative value.
Example sentence: How much water does this process require?
You can go through more grammar and vocabulary-related stuff at Usage & Grammar lesson under Verbal Ability in Prep Zone.
Here's the direct link: https://mockat.com/prepzone/#verbal-ability
I'd also suggest you attend our free Verbal Trial sessions. If you are interested and need more details regarding the trial sessions, do contact this number: 9600 121 800
Hope this answered your doubt. All the best for your prep.