Subj : rules of this echo
To   : Alexander Koryagin
From : Anton Shepelev
Date : Wed Dec 19 2018 00:40:40

Alexander Koryagin:

AK>> Do you think it would be more logical if we use them
AK>> vice versa? ;=)

AK> Hey, Ardith! ;-) After "if" I used a simple future time
AK> -- why not? I don't want to use the subjunctive mood in
AK> both clauses.

Start with the standard simple classification of
conditionals into three categories:

    I.   He will find me if he knows how.
   II.   He would find me if he knew how.
  III.   He would have found me if he had known how.

Then learn the various "mixed" forms.  You can't mix them in
whatsoever way it likes you, but must follow the logic of
the tenses.  I highly recommend Baskerville and Sewell's
short and clear explanation:

  http://www.gutenberg.org/files/14006/14006-h/14006-h.htm#Page_139

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