YOU SAID:

when the cat's away the mice shall play

INTO JAPANESE

猫がいないときはネズミたちが遊ぶだろう

BACK INTO ENGLISH

Mice will play when there is no cat

INTO JAPANESE

猫がいないとネズミが遊びます

BACK INTO ENGLISH

Mice play when there is no cat

INTO JAPANESE

猫がいないときはネズミが遊ぶ

BACK INTO ENGLISH

Mice play when there is no cat