YOU SAID:

There once was an old man who scared all the annoying children frequently

INTO JAPANESE

一度よくすべての迷惑な子供たちを怖がらせた老人があった

BACK INTO ENGLISH

Once all unwanted children to scare while he was an old man

INTO JAPANESE

彼は　昔診た患者だ

BACK INTO ENGLISH

He was an old patient.

INTO JAPANESE

彼は　昔診た患者だ

BACK INTO ENGLISH

He was an old patient.