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Can I say,

(i) Long time ago, there was an owl. It lived on an old tree that near the ground of a university.

(ii) The tree grew in the ground of a university.

(ii) Long ago, there was an owl who lived near the ground of a university.
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(i) A long time ago, there was an owl. It lived on in an old tree that near the grounds of a university.

(ii) The tree grew in the grounds of a university.

(iii) Long ago, there was an owl who that [but "who" is possible in a story that gives the owl a human-like character] lived near the grounds of a university.
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Hi,

As N2G says, MM has already answered the very same questions in another thread: http://www.EnglishForward.com/English/InOnAt/gwwxh/post.htm ,
so I am locking this thread. Please go to the other one if you have some more questions on this topic.
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I'm really confused! It's "in the grounds" or "on the grounds"?

Can I just say, "in a ground"? Why do you say "in the tree" ? not "on the tree"?
Vincent, check MM's reply in another thread of yours on a similar topic. Also, I think those who help you expect some gratitude once a while. A simple thank you would be great.
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 Tanit's reply was promoted to an answer.