Keep the letter when its vowel weakens
Hear stress and mild vowel reduction in words.
About this unit
Vowels sound full in the strong syllable. In weak syllables а and о can weaken, but the spelling stays the same.
| Letter | In the strong syllable | In a weak syllable |
|---|---|---|
| а | a: мак | closer to ъ: ри́ба |
| о | o: нос | closer to у: гора́ |
The letters do not tell you where the stress falls: learn it with each word’s recording.
Read the examples
Tap a card and listen. Try saying it too.
Words to read

вода́
watervodá
море́
seamoré
въ́лна
woolvǎ́lna
вълна́
wavevǎlnáReading tips
Unstressed а can approach ъ, and unstressed о can approach у. Amounts vary by speaker and context. Bulgarian reduction is not the Russian system: follow Bulgarian whole-word audio and preserve the written vowel.
Reading practice
Find the strong syllable
Listen and choose the stressed syllable, counting from the beginning.
Find the strong syllable
Listen and choose the stressed syllable, counting from the beginning.
Find the strong syllable
Listen and choose the stressed syllable, counting from the beginning.
Read with support
Match the words to their pictures.
Read without a sound cue
Match the words to their pictures.
Sound to spelling
Listen. Choose the spelling.
Spelling to sound
Read the word. Choose its sound.
Sound to spelling
Listen. Choose the spelling.
Read and decide
Does a weakened о automatically become written у?
Build the word
Listen and build the word in typing order.

Build the word
Listen and build the word in typing order.

Build the word
Listen and build the word in typing order.

Recall the spelling
Listen and build the word without its picture.
Recall the spelling
Listen and build the word without its picture.
Recall the spelling
Listen and build the word without its picture.
Finish practice to save this unit.
You can read and write this
Hear stress and mild vowel reduction in words.

вода́
water
море́
sea
въ́лна
wool
вълна́
waveUse a Bulgarian keyboard
Bulgarian has a standard BDS layout and widely used phonetic layouts. Either is optional: the guided course has on-screen tiles. Keep ъ and ь separate. Teaching acute accents may be omitted in input; the grave in ѝ belongs to the word and is not a removable stress hint.