Softening vs. Non-Softening Vowels

How я ё ю е и soften the previous consonant (and how their partners don't).

Vowel Pairs
Non-softening   Softening
а [а] < -- > я [йа]
о [о] < -- > ё [йо]
у [у] < -- > ю [йу]
э [э] < -- > е [йэ]
ы [ы] < -- > и [и] 

Core rule:

  • Softening vowels я, ё, ю, е, и after a consonant sound like their pairs а, о, у, э, ы and soften the preceding consonant (marked with ʹ).
  • Softening vowels я, ё, ю, е at the start of a word or after another vowel, are pronounced with a short "y" glide: йа, йо, йу, йэ (no consonant to soften here).
  • Non-softening vowels а, о, у, э, ы are almost always pronounced as written (no "y "glide) and never soften the consonant before them.

Vowel Pairs and Pronunciation

Skipping special rules after sibilants (see exceptions below).

  Non-
softening
Softening After a consonant After a vowel Word start
а ма́ма [m a-ma]
диа́метр [d'i- a-m'etr] а́том [ a-tom]
я мя́со [m'a-so] края́ [kra- ya] я́блоко [ ya-blo-ko]
о мо́ст [most] зоопа́рк [za-a-park] океа́н [o-ke-an]
ё лёд [l'od] поёт [pa-yot] ё́лка [yol-ka]
у су́п [sup] соу́с [sous] у́м [um]
ю лю́ди [l'u-di] пою́ [pa-yu] ю́мор [yu-mar]
э нэ́п [nep] поэ́т экза́мен
е коме́та [ko-m'e-ta] пе́ние [p'e-ni-ye] е́нот [ye-not]
ы
(hard “i”)
мы [mi]
и
(soft “i”)
мир [m'ir] мои́[mo-i] (note: no [yi]) игла́ [i-gla] (note: no [yi])
Exceptions / special consonants:
  • ж, ш are always hard; ч, щ are always soft (the vowel doesn't change that).
  • ц is usually hard; before и it often sounds like [ɨ]-type (“цы”).
  • After sibilants the “y-glide” may disappear (e.g., же is [ʐe], not [ʐye]). We skip these in the table to keep the core rule clear.

Why и and ы are different: unlike я/а, ё/о, ю/у, е/э, the pair и/ы does not alternate with a y-glide at the start of words. И is simply [i] and softens the preceding consonant; ы is a separate vowel [ɨ] that follows hard consonants and never adds a [j] sound.

Tip: compare мир [m'ir] “peace/world” vs. мы [my] “we”.

Practice: Soft vs. Hard (paired examples)

Transliteration [...] uses ' to mark a softened consonant, always after a consonant; the stress mark is always above or next to a vowel.

  • ю́мор — humor [yu-mar]
  • у́м — mind [um]
  • Ева́нгелие - The Gospel [ye-ván-g'e-l'i-ye]
  • ено́т — racoon [ye-nót]
  • экза́мен — exam [eɡ-zá-m'en]
  • лю́к — hatch [l'uk]
  • лу́к — onion/bow [luk]
  • би́ть — to beat [b'it']
  • бы́ть — to be [bit']
  • ге́незис — genesis(origin) [g'e-n'e-z'is]
  • га́мма — gamma [gá-ma]
  • дья́кон - deacon [d'ya-kan]
  • дека́н - dean [de-kán]
  • до́м — home/house [dom]
  • пе́снь — hymn/song [p'esn']
  • Па́сха — Pascha/Easter [pá-scha]
  • фи́льм — film [f'il'm]
  • миф — myth [m'if]

More good pairs to try aloud: свет / святой [sv'et / sv'atoj], пи́лот / пыль [p'ilot / pyl'], ге́ний / го́род [g'enij / go-rod].