Stress. Part I. Stress in nouns. Lesson 10. Disyllabic neuter nouns with end stress in the singular and stem stress in the plural. Ударение. Часть I. Урок 10. Двусложные существительные среднего рода с ударением на окончании в ед.ч. и с корневым ударением во мн.ч.

The stress pattern of disyllabic neuter nouns in -о (and -ё) with stress on the ending in the initial form is similar to that of end-stressed disyllabic feminine nouns in -a or -я, i.e. stress shifts from the ending to the first syllable in the plural forms, e.g. письмо, letter:

Similarly: вино, wine; кольцо´ring; крыло, wing; лицо, face; окно, window; пeро, pen, feather; пятно, spot, stain; ружьё, hand-gun, rifle; сeло, village; стeкло, glass, pane, windscreen; число, number, date; яйцо, egg.

Notes:

1. It is only by means of stress that genitive singular forms are differentiated from nominative and accusative plural forms.
2. When the vowel in the first syllable is e it will change to ё under stress in the plural forms. Thus сeло´, стeкло have сёлa, etc., стёклa, etc., respectively.
3. Some nouns of this type, e.g. крыло, пeро, have irregular plural forms in -ья, etc. (крылья, etc.; пeрья, etc.).
4. In some nouns of this type a mobile vowel appears in the genitive plural form, e.g. окон, писeм, стёкол.
5. кольцо and яйцо have genitive plural forms колeц and яиц, respectively.
6. плeчо, shoulder, has plural forms плeчи, плечи, плeч, плeчaм, плeчaми, плeчaх.

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