YOU SAID:

i am being held captive

INTO JAPANESE

私は捕虜にされています

BACK INTO ENGLISH

I have been taken prisoner

INTO JAPANESE

私は囚人にされました

BACK INTO ENGLISH

I was made a prisoner

INTO JAPANESE

私は囚人になりました

BACK INTO ENGLISH

I became a prisoner

INTO JAPANESE

私は囚人になりました

BACK INTO ENGLISH

I became a prisoner