THEY'RE VS.THEIR VS.THERE - 英語でよくある文法の間違い

"THEY'RE" is a contraction for "they are". 

"THEY'RE "は、"they are "の短縮形です。

For Example: "THEY'RE hungry."

例えば、以下のようなものです。"THEY'RE hungry" (飢えている)

"THEIR" refers to something owned by a group. 

"THEIR "はグループで所有しているものを指します。

For Example: "They're hungry and want to have THEIR lunch."

例を挙げると"They's hungry and want to have THEIR LUNCH" （彼らはお腹を空かせていて、their lunchを食べたいと思っている）。

and "THERE" refers to a place.

で、「THERE」は場所を指します。

For Example: "They're hungry and want to have their lunch over THERE." 

例を挙げると"They's hungry and want to have their lunch over THERE" (彼らはお腹を空かせていて、ランチをあそこで食べたいと思っている)