YOU SAID:

If I was a cat I would sleep all day long

INTO JAPANESE

もし私が猫だったら、一日中寝ていただろう

BACK INTO ENGLISH

If I had been a cat, I would have slept all day.

INTO JAPANESE

もし私が猫だったら、一日中眠っていたでしょう。

BACK INTO ENGLISH

If I had been a cat, I would have slept all day.