Should vs. Could.
A disambiguation í examine within myself prior to jumping to my dictionaries; because, the distinction causes dissonance within myself.
For instance, if you tell me Í should do something Í wince.
Howl if Í know why.
If you tell me í could í feel appreciative.
Could refers to actionable phenomenon. Capable of manifesting.
Should refers to the realm of thought; implies a best course of action.
Just because you should do something does not necessarily mean that you could.
Just because you could do something does not necessarily mean that you should.
Is should a moot point or a hung jury?
And then there’s would.
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Sure enough, but would only operates in the past or hypothetical?
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Yes, I believe it does.
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