YOU SAID:

There are many forms of they're that are theirs

INTO JAPANESE

彼らのものはたくさんあります。

BACK INTO ENGLISH

There are many of them.

INTO JAPANESE

ありすぎだ

BACK INTO ENGLISH

There are so many of them.

INTO JAPANESE

ありすぎだ

BACK INTO ENGLISH

There are so many of them.