Hi, Paco,
As I said above, I don't think of "will" and "would" as subjunctive in any way.
Independent of that, this "rude" vs. "polite" observation of yours doesn't work for my way of speaking English.
[pres subj : rude / past subj : polite]
Won't you come with us? Wouldn't you come with us?
I will go with you. I would (like to) go with you.
They won't stop smoking. They wouldn't stop smoking. |
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I hear "Won't you come with us?" as polite, certainly not particularly rude. A variant is "Won't you please come with us?"
I don't hear "Wouldn't you come with us?" as especially polite or rude. It doesn't even sound really idiomatic in comparison with "Wouldn't you like to come with us?"
I don't see the second pair as an illustration of 'rude/polite', either.
The only thing different to me about "They won't stop smoking" and "They wouldn't stop smoking" is tense. The first is present "They refuse to stop smoking", and the second is past "They refused to stop smoking".
So, in summary, I'd have to say that I don't see the contrast between "will" and "would" as the difference between indicative and subjunctive, but as a variety of differences: the difference between present and past is one (the 'smoking' example; the 'swimming' example); the difference between unconditional (I'll go with you (no matter what)) and conditional (I'd go with you (provided you paid, if you weren't going to be too long, if the weather were better, ...)) is another. I think the latter difference (unconditional / conditional) is what you are calling "strong"/"soft" ("weak").
CJ