in / on / at

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Vincent Teo  #542987  Fri, 18 Jul 08 10:40 AM
Can I say,

Once, there was an owl who lived in / on / at an old tree. The tree was in / on /at the ground of a university.
  
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Mister Micawber  #542991  Fri, 18 Jul 08 10:44 AM
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Didn't we do these prepositions long ago, Vincent?  Owls are generally hole-dwellers.

Once there was an owl who lived in an old tree. The tree was on the grounds of a university.
  
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Vincent Teo  #542993  Fri, 18 Jul 08 10:48 AM
Thanks. Can you explain, why do we use "in the tree"? Why do we say "on the grounds", but not "in a ground" without "s"?
  
26TMNTJG2PG  #542994  Fri, 18 Jul 08 10:49 AM
Once, there was an owl who that lived in / on / at an old tree. The tree was in / on /at the ground of a university.
  
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Mister Micawber  #543049  Fri, 18 Jul 08 01:48 PM
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Why do we use "in the tree"? -- Because the owl's home is inside the tree.

 Why do we say "on the grounds", but not "in a ground" without "s"?-- 'Grounds' =  'a tract of land cleared for some special purposes (recreation or burial etc.); the enclosed land around a house or other building'.  That is the definition of the word; there is no singular 'ground' with this meaning.  'On' because that is the usual collocation-- the tree is on the tract of land; 'in' is possible but not as frequent.  'In the ground' is completely wrong here; that phrase would be used of a potato.

'An owl that' is OK, too, but I prefer 'an owl who', since the owl's cry is 'Hoo!'
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