I would like to know which would be the correct form:

  • a major two-day auction
  • a major two days auction

The duration of the auction is two days. Which form is the right one to use?

marked as duplicate by Andrew Leach, choster, JLG, Kristina Lopez, aedia λ Nov 19 '13 at 21:07

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First variant is OK, the second is almost OK (the apostrophe is absent):

"a major two-day auction"

"Two-day" is an adjective here, written as one word.

"a major two days' auction"

" two days' " is a possessive form ("an auction of two days").

First variant is more common to use.

  • Does 'almost OK' mean you get let off with a grammar police warning? – Edwin Ashworth Nov 19 '13 at 20:58
  • By "almost ok" I meant the apostrophe was omitted, edited to make it clear – Vilmar Nov 20 '13 at 8:42

two days refers to the number of days two-day refers to the duration of something If you are French, think about the difference between jour and journee.

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