Verb stem mutations question

[tectonic-drift.livejournal.com]

I read about the following pattern:

If the letter Г, з, or Д precedes the stem vowel, then the consonant mutates to a ж. In a first conjugation verb, the mutation occurs in all forms, but in 2nd conjugation verbs the mutation is in 1st person singular only.

However, the verb обедать does not follow the pattern, where as видеть does follow the pattern. Is обедать just an exception or am I missing something?

Comments

[oryx_and_crake]

I am not aware of such a pattern. I can name a few other verbs that don't follow it (e.g. бегать - бегаю). Besides, in видеть the letter Д does not precede a stem vowel: the E in видеть belongs to the ending, not to the stem.

[denmakh.livejournal.com]

Are you sure it belongs to the ending? Isn't -ть a form-building suffix here? If so, the stem is виде-.

[oryx_and_crake]

видИМ

[viata.livejournal.com]

Historically it's due mostly to the palatalizations, i.e. change of some Proto-Slavic and Old Russian consonants before the front vowels (e, i, etc.) and j. So, with verbs it's the matter not of a stem vowel, but the ending.

For the second conjunction (first-person singular form) the last consonant of the stem (infinitive without "ить") changes as follows:
д > ж (ходить - хожу, BUT ходишь, ходим, ходите, ходит, ходят)
з > ж (возить - вожу)
c > ш (носить - ношу)
ст > щ (чистить - чищу)
т > ч (крутить - кручу)
б, в, м, п, ф > бл, вл, мл etc. (рубить - рублю, давить - давлю, копить - коплю)

[tectonic-drift.livejournal.com]

Thanks for the help.

[miaumur.livejournal.com]

I have never heard about such a rule... And I also believe that the stem of видеть is вид-, and -и- is a verb suffix like -ть.

[joliecanard.livejournal.com]

This rule applies only to verbs whose stem ends in a consonant. For обедать, the stem is actually (morphologically) obedaj-, whereas for видеть the stem is vid-.
Check out Townsend's Russian Word Formation.

[tectonic-drift.livejournal.com]

Thanks.