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There used in a few sentences
(a) Stand over there until I call you.
(b) Put it there on that table
(c) Please go home and stay there.
A word with the opposite meaning: here
(a) in or at that place
(b) in or at a place other than that of the speaker -- opposed to here
Function: adjective. It is Used as a modifier before a noun: their accomplishments; their home town.
Their used in a sentence: the delicious aroma drifting across a neighbour's fence of food cooking over charcoal is enough to make anyone yearn for a barbecue of their own.
Definition: the possessive form of