YOU SAID:

there there and they're going to find their ball

INTO JAPANESE

そこに彼らは彼らのボールを見つけるつもりです

BACK INTO ENGLISH

There they are going to find their ball

INTO JAPANESE

そこで彼らは彼らのボールを見つけるつもりです

BACK INTO ENGLISH

So they're going to find their ball

INTO JAPANESE

だから彼らは彼らのボールを見つけるつもりです

BACK INTO ENGLISH

So they're going to find their ball