When one should add 's and when not?


  • Task due date / Task's due date
  • Company name / Company's name
  • Form field / Form's field
  • Customer service / Customers' service
  • When you use the above as headings, omit the possessive apostrophe. It's simpler and clearer. Jun 11 '20 at 18:36

The versions without the genitive marker 's are very common. Nouns are used to modify other nouns. Wikipedia calls that use "noun adjunct":
Wikipedia "noun adjunct"

The version with the marker 's is used when the item identified isn't being viewed as a single unit. For example, you might say "This form's field for name is too short.". But to refer to a field on a form in general, you would say "form field".

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