YOU SAID:
The dark sky must not herald a storm.
INTO JAPANESE
暗い空が嵐を告げてはいけません。
BACK INTO ENGLISH
The dark sky must not tell the storm.
INTO JAPANESE
暗い空が嵐を告げてはいけません。
BACK INTO ENGLISH
The dark sky must not tell the storm.
That didn't even make that much sense in English.