It is from research that knowledge is gained and I would not like to be a person who assisted in your lack of knowledge; particularly where it sounds as if it is a first year question.
Some clues:
Look at land law, particularly dominant & subservient tenants which may continue despite change of ownership.
Look also at fee simple, registration of encumbrances, right of way, easement of necessity & profit A prendre.
Good Luck.
yeah I was gonna say, read your handy chapter on easements in your given land law text book.
Seems a bit cruel
but that is what I would have to do anyway.