>>1 He-he... well, that's a way it is. Even native Russian speakers sometimes cannot speak (much less write) it properly. Surely, modern Russian has a WAY too many grammar & spelling rules. I myself forgot most of them when I finished the school. Still, I speak and write with confidence 'cause i read many classic books and I just remember how to write almost any single word that exists in Russian. Doubt it's possible for a foreigner... And mind that there are plenty derived words.
Но панталоны, фрак, жилет -
Всех этих слов на русском нет.