sebastian, of course you're not imposing (and you don't actually have to make that verb reflexive); thank you for the detailed explanation. Thanks also to Cro-Mignon for the answer to another question.
I appreciate all that effort, but I find myself asking what purpose the numbers serve, how numbering them helps a learner. Why
call the first three sentence types 1, 2, and 3, and the other two mixed? Aren't 1, 2, and 3 also mixed, in the sense that the clauses don't have the same verb forms as each other? Couldn't you just as well call them all 1, 2, 3, 4, 5? Or just call 1 conditional or if-then or something, 2 hypothetical, and 3-4-5 contrary-to-fact -- anything that would at least have some content in the designations?
It still just seems to me that treating contrary-to-fact clauses as a group, and thinking about each clause separately, might be more useful to learners than trying to list combinations of clauses. Perhaps it serves some purpose for people coming from another language, but if so, I can't quite think what it is.
I hope you don't feel like we've all ganged up on you and left you with no benefit from this admittedly exhausting discussion.
Just in case, here are a couple of links on English comma ruleshttp://www.bartleby.com/141/strunk.htmlhttp://owl.english.purdue.edu/owl/resource/607/02/
that I got from this antique threadrelated discussion: Kommaregeln
There are some other threads called Kommaregeln in the forum archive (Suche in allen Foren).
Not everyone will agree with all points in those links -- the current version of the OWL list seems wrong to me on 13 and 15a (what the ...?), and both it and Strunk follow AE usage on things like dates and serial commas. But for anyone who was never taught that English had any punctuation conventions at all, it could be a stimulating place to start, and there are several other pages to browse around should the subject, er, arouse your interest. (-:
Has any of this helped you at all? I hope so, but in any case, thanks for letting us take your thread and run with it.