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apostrophe s

In two sentence below why  the word "car" don't get apostrophe s for possession.
How do car engines work?
How a Car Engine Works.


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Lollzayy profile picture LollzayyJuly 2019
Apostrophe S is used to show possession. For example: The boy’s lunch. So you could put the car’s engine and that would be correct, but it is just not necessary to express that you are talking about an engine.
dewijones profile picture dewijonesJuly 2019
This is a noun noun structure. Other examples would be
School meals
Church bells
Cat food
  • MarthaO profile picture MarthaOJuly 2019
    Except it is not exactly a noun-noun.
    In those examples, school, church, and cat are being used as adjectives.
MarthaO profile picture MarthaOJuly 2019
How DOES a car's engine work?
the engine of a car= the car's engine