YOU SAID:

the cat asked the horse when it was time to attend the party.

INTO JAPANESE

猫は馬に、パーティーに参加する時間はいつですかと尋ねました。

BACK INTO ENGLISH

The cat asked the horse when it was time to join the party.

INTO JAPANESE

猫は馬にいつパーティーに参加するか尋ねました。

BACK INTO ENGLISH

The cat asked the horse when he would join the party.

INTO JAPANESE

猫は馬にいつパーティーに参加するか尋ねました。

BACK INTO ENGLISH

The cat asked the horse when he would join the party.