Long ago and Until now

Long ago adverb - Of the distant or comparatively distant past.

Until now and long ago are semantically related in earlier topic. In some cases you can use "Until now" instead an adverb phrase "Long ago".

Until now adverb - Used in negative statement to describe a situation that has existed up to this point or up to the present time.

Long ago and until now are semantically related in earlier topic. Sometimes you can use "Long ago" instead an adverb phrase "Until now".