YOU SAID:
They shouldn't be allowed to do that
INTO JAPANESE
彼らはそれをすることを許されるべきではありません
BACK INTO ENGLISH
They should not be allowed to do it
INTO JAPANESE
彼らはそれをすることを許可されるべきではありません
BACK INTO ENGLISH
They should not be allowed to do it
That didn't even make that much sense in English.