At debating around condition cluas, what we should notice around is just auxiliary verb's usage at our daily practical spots for us as the very integral occasion.

Then, as the first, we should take them into account to run this debating content.
First, affirmative form or system as our conscious basis.

❄  It is ～. 
This means so generalized view as commonsense and definitively fixed idea in infromation or mentioning to us functioned at social sites. Then, it could be so frank and never so grave mentioning at our daily conversation.

❄   It can be～
This means so probable to say or mention in reason, in other words, resonably necessary expression is needed at our conversation and reporting or informing.
Necessarily it includes and implies that mentioned or reported contents could be in moratorium at indicating any substantial intention at being accompanied with aim or object at sites.

❄  It could be～
This means hjgher degree probable condition's mentioning at our daily life at any site. Not vague nor not clear so much, then very generalized view applied modus ponens. Necessarily it means so normally appropriate at indicating only not so misunderstood mentionning. 

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❄  It might have been～ or It may have been 
This means ambiguously fuzzy conviction in context of conversation at having intuitively driven theory. Then essentially it indicates either the will or intention to get talked issue at
🔲Epoché in terms of colcluding around subject at conversation. Then this usage is expedient subjective understanding driving intentional usage. _ 🔲Epoché；To hold off on  making decision.

　　　❖　These two indications are having meaning as "Ambi-valence at Trtiplity". 

　
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❄  It must have been～
This usage relies on speakers' desperation at the one's circumstance in reporting so emergently at the situation for the present with the must to  run through, trhus necessarily its usage could be at so instant disposing modus ponens. 

❄  It must be～ 
This usage relies on speakers' desperation at judging necessity at any site of reporting and infroming in terms of allegation as alleging necessary occastion. 

❄  It ought to have been～
This usage evidences the speakers' easy and lazy skepticism toward denial to mentioned thing. Then, that usage usually could be so effective at speaking anything so frank.

❄  It ought to be～
With just upper defitinitve meaning's suggestion, this means so decisive mentioning at confessiong true mind to the others for speakers.

　
　　　　　❖　These upper four items signifies ”Bivalence Duality”. 

By the way, if we couldn't start anything only after completion in understanding our signification around as the premise for doing everything, we could never do anything. 
Then, to some extent, we, switching stance, course, or method, try to fix ultimate object.

Upper mentioned circumstance must have us driven to speak these discerned ways for speaking to the other one or ones.

Otherwise, in terms of revisional necessity, we revise any orbit around practicing to head for object for the present, that revision means switching objective value or recognition around it as to be reset, necessarily according to running situation for us so personally and belong to the group's totalized aspect, and really realized condition for us at doing everything.

(to be continued)

Memorandum but so Essentially Integral mentioning; Next chance to debate at Part20 must spend of Intuitive driven theory at this analysis caused from  Intuitionistic Type Theory as Dependent Type mainly acheived by Per Martin-Löf（1942-). It will mean that duality's limitation for future advancing could be shown at his theory, in other words, some kind of desperation for denial means that its stance could be created with dualism's mainly reality at adademic circle, but actually nowadays so tough situation for human-being must never be solved with its idea, then there we must need some another recognition, and it must be triplity driving idea, in other words, we need positively buffer zone for debating and making decision, and these things mean the necessity to keep very assorted neutral values and estimating system with changeable and switchable evaluation at keeping moderate or amvibalent mind's modus ponens as the tool to solve all diffioculuties at guiding us to not alternative but with so positively another optional filed possibility's preserving for any searching site. If we get this method, we must have all issues solved at any issue, because it must include universal system for leaving any kind of not intended nor not headed for very useful moratorium relying on no alternative. 

Feb. 17th. 2021