I am wondering about "would" can be also used to express the degree of certainty. Not any website shows any example sentences using "would" to express the degree of certainty only except for the under website. https://medium.com/@gmbley/modal-verbs-levels-of-certainty-ba14047dd134 This site only shows "would".

Anyway, I have also read this previous Q & A (Would vs will degree of certainty),

According to this, "Would" is only used under hypothetical conditional sentence like Type 2 conditional sentence?

If yes, the under-mentioned sentences using "would" are also under hypothetical conditional sentences??? enter image description here enter image description here enter image description here

FYI: Those example sentences are from Collins, Macmilland, and Longman dictionary.

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    In contexts like You wouldn't know him, That would have been her car, using the modal would is really just a convention that [arguably] slightly "softens" an assertion and/or "distances" the speaker from the words. Often, all it conveys is something along the likes of It's really too trivial to bother mentioning or even thinking about, but if we did want to consider the matter, we would discover / agree [that you don't know him / that it was her car]. – FumbleFingers Jan 28 at 16:18
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    Would does carry some degree of probability, but it is so close to certainty that it functions more as a social nicety. It also expresses incredulity -- compare: "Why did anyone want to kill..." vs "Why would anyone want to kill..." It is a touch more formal and thus can be more serious or weighty. – FeliniusRex Jan 28 at 17:25
  • @FeliniusRex /// Hi, that usage of "would" is kind of being convention, right? However technically speaking that usage also stems from Type 2 conditional sentence? In this case, the nuance is different to the basic form of Type 2 conditional. – Tae-Bbong-E Jan 29 at 0:44
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    Nobody when speaking thinks, "Oh, I want to use a type 2 conditional sentence here." They just express incredulity or distance themselves slightly from the action. It's not about logic -- it's about finding the tool to communicate the information or the emotion. Examples: Why would anyone want to kill Suzie? How would you even do that? I wouldn't do that, if I were you. Why would Raymond kill Mrs. Peacock in the dining room, with the knife? – FeliniusRex Jan 29 at 13:45
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    @Tae-Bbong-E Yes, you've got it. :) – FeliniusRex Jan 29 at 15:27

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