I agree, Mem. Those you mention are very typical! They're the "probable"-type conditional sentences (subjunctive in the condition [= past form in English] + conditional in the consequence-clause).
I should have mentioned before that the "impossible" conditional sentences take perfect forms for subjunctive + conditional (hubiera ido/venido, etc. + habría ido/venido, etc)
In any case, I agree it's a disgrace so many people make that mistake but worse that it's SOOOOOOOO accepted. :-(
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