to ci powinno rozjasnic sprawe:
quote,
“The use of the past perfective in before-constructions requires special consideration. These four sentences seem to be equivalent in meaning:
[11] I saw him before he saw me.
[12] I had seen him before he saw me.
[13] I saw him before he had seen me.
[14] I had seen him before he had seen me.
Sentence [13] appears to be paradoxical in that the second in the succession of events is marked with the past perfective, contrary to what we have noted above in after- and when-clauses. The explanation (cf 15.27) is that the before-clause in [13], and perhaps also in [14],
may be nonfactual; that is to say, the event in the before-clause may not have taken place ('He did not get a chance to see me, because I evaded him')
unquote