YOU SAID:

the cat wore red shoes when he went to the party

INTO JAPANESE

彼がパーティーに行ったとき、猫は赤い靴を着た

BACK INTO ENGLISH

When he went to the party, the cat wore red shoes

INTO JAPANESE

彼がパーティーに行くと、猫は赤い靴を履いた

BACK INTO ENGLISH

When he went to the party, the cat wore red shoes