Thread: Falling vowels

As for falling vowels I see "Some masculine nouns having e, ë, o in the last syllable of singular nominative lose it (this vowel) in the declination: И. продав(é)ц, Р. продавцá.
It is possible to limitate somehow this "some"? Or in every case one must go to the dictionary? Thank you.

I don't think there is really an exact rule about this. Here's what the Russian Self Teaching Guide has to say:

"Many nouns of more than one syllable ending in -ец and -ок behave in this way."

examples:
отец/отцы
американец/американцы
купец/купцы
конец/концы
орёл/орлы (obviously not quite the same rule here)
кусок/куски
городок/городки
рисунок/рисунки
значок/значки
огонь/огни

I thought about it and even asked some people around...

Looks there is no strict rule.

This forum reveals to me mysteries of my language.

Thank you. About Russian language everything can be expected . I will copy these words.
For it-ogo: These insidious questions of foreigners...
"Admirose un portugués
De ver, que en su tierna infancia,
Todos los niños en Francia
Sabían hablar francés.
'¡Arte diabólico es!
-dijo torciendo el mostacho-
pues para hablar el gabacho
un hidalgo en Portugal
llega a viejo y lo habla mal
y aquí lo habla un muchacho' ".
---
gabacho = French (person and language)
Thanks.

Хорошая ссылка: http://www.speak-russian.info/time_new/rus/grammar/

"Many nouns finishing in -ец, -ок". There isn't little; in every book I have seen just says "many nouns having o, e, ë...". Thank you.

Originally Posted by radomir

"Many nouns finishing in -ец, -ок". There isn't little; in every book I have seen just says "many nouns having o, e, ë...". Thank you.

Yes, many of them. But not all of them ( подлец-подлеца, исток-истока...) and not only they (день-дня, сон-сна, козёл-козла...)

Thank you. In these more common words день, сон I had found quite natural this floating vowel . Looking the words where this vowels don't dissapear it seems that the "rule" is making the pronountiation easier and more fluent, since истóк - истка seems more difficult than истóка. Thanks.