hello guys i came across a question that is:

Mammoth Cave in Kentuck,Whic is ...... cave in the world,has 345 miles of subterranean passageways.

i reduced the answers to the longest and longest.But ı dont know what is the difference between them

2 Answers 2


A cave is a "countable noun", so

Mammoth Cave in Kentucky, which is the longest cave in the world, has 345 miles of subterranean passageways.

Please see the Oxford Dictionary page about Countable and uncountable nouns

  • 2
    actually, the correct answer is the other one. You must use the superlative, and that is not possible without "the".
    – virolino
    Mar 5, 2019 at 13:13
  • 1
    Indeed, this does not answer the question. "The tallest trees in the world" is plural, and "the most polluted air in the world" is uncountable, and they both require the determiner. -1
    – Colin Fine
    Mar 5, 2019 at 13:14
  • @ColinFine true, I overlooked the superlative, but I never vote on other answers when I have submitted one. Otherwise there will be answer wars over which is the better answer, and frankly, is plain rude. Your answer speaks for itself. Mar 5, 2019 at 13:36

I can't think of any contexts in which we would use a superlative like longest without "the" or another determiner like "my" (except in Headlinese, where articles are usually omitted).

  • please write a few words about forming the superlative, to make things most obvious. +1. I can add it myself if you agree.
    – virolino
    Mar 5, 2019 at 13:12
  • The formation of the superlative is very basic English grammar, covered in any number of reference works. I don't think it appropriate to reproduce here.
    – Colin Fine
    Mar 5, 2019 at 13:16
  • I agree it is basic knowledge. However, the purpose would be to attract attention to the answer - which is definitely better than the chosen one. At least make the word "superlative" bold? :)
    – virolino
    Mar 5, 2019 at 13:21

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