YOU SAID:

Once my goldfish started walking, I laughed at its feet.

INTO JAPANESE

金魚が歩き始めると、足元を笑いました。

BACK INTO ENGLISH

When the goldfish started walking, he laughed at his feet.

INTO JAPANESE

金魚が歩き始めたとき、彼は足元で笑った。

BACK INTO ENGLISH

He laughed at his feet as the goldfish began to walk.

INTO JAPANESE

金魚が歩き始めたとき、彼は足元で笑った。

BACK INTO ENGLISH

He laughed at his feet as the goldfish began to walk.