YOU SAID:

there can only be one good boy in town

INTO JAPANESE

町にはいい子は一人しかいられない

BACK INTO ENGLISH

There is only one good boy in town

INTO JAPANESE

町にはいい子が一人しかいない

BACK INTO ENGLISH

There is only one good child in town

INTO JAPANESE

町にはいい子が一人だけ

BACK INTO ENGLISH

There is only one good child in town