YOU SAID:

For a long time, this sign has been useful...

INTO JAPANESE

長い間、この標識は役に立ってきました...

BACK INTO ENGLISH

For a long time, this sign has served me well...

INTO JAPANESE

長い間、この標識は私に役立ってきました...

BACK INTO ENGLISH

This sign has served me well for a long time...

INTO JAPANESE

この標識は長い間私に役立ってきました...

BACK INTO ENGLISH

This sign has served me well for a long time...