There:
It's a place: "The ball is over there."
It can also be used to mean "there is". In that case one would say "there's". "There's nothing left to see."
Their:
It belongs to somebody. "It's their problem."
It can also be used in the plural. In that case one would say "The problem is theirs."
They're
It is short for "they are". "They're going down fast."
Carry on.
It's a place: "The ball is over there."
It can also be used to mean "there is". In that case one would say "there's". "There's nothing left to see."
Their:
It belongs to somebody. "It's their problem."
It can also be used in the plural. In that case one would say "The problem is theirs."
They're
It is short for "they are". "They're going down fast."
Carry on.
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