What is the connection between volitional よう form and であろう


I was wondering, what does the よう form of ある even mean? Does あろう act as
volition of the object being spoken about? For example... if someone says
雨が降るでしょう(であろう）... is it the same as "It WILL rain" in that volition is being
applied to the object being spoken about?

I'm not looking for ties to English, it's just a lucky example.

No matter how many times someone tries to explain でしょう to me it doesn't make
sense... I've been trying to think of it as "It is my guess that"... but it
doesn't work in some cases...

**I still figure that there are two options:**

  1. _The kinda iffy option based in someone telling me that the よう form is comprised of a "guess particle"... "う":_

The よう form highlights your guess about the future... so saying 行こう means that
you are placing your bets so to speak that "going" is what most probably will
eventuate.

  2. _The way I think makes more sense:_

よう form truly does equate to our "will" and thereby is used in the same sense
as "I will go"”行こう" and "it will rain""雨が降るでしょう"




As someone who has never studied Japanese as a foreign language, I am often
amazed at how often I hear Japanese learners use the word "volitional" because
they seem to use it even where volition appears least relevant by Japanese
standards. Whether it rains or not has nothing to do with anyone's volition,
for it is a natural phenomenon.

であろう：

で: the 連用形 of the concluding auxiliary verb だ

あろ: the 未然形 of the verb ある

う: the inferring auxiliary verb

でしょう is the polite form of であろう. Both mean the exact same thing in the context
雨が降るでしょう（であろう）= "It is mostly likely to rain.".

Regarding でしょう that you feel does not make sense at times, you may need to
give some examples for us to discuss it. It is indeed used in different
situations.

