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Alphabet & vocabulary

Greek Vowel Combinations: Read ου, αι, ει and οι

Practise four common Greek vowel combinations with short words, a reading worksheet and answers. Learn when two letters represent one sound.

grecfacileUpdated Nov 7, 2026 · 2 min read
Greek Vowel Combinations: Read ου, αι, ει and οι

You recognise the Greek letters, but και still looks like “kai” and μου like “moy”. The missing step is learning which letters work together. In modern Greek, these four common pairs usually represent a single vowel sound. Practise the pair as a unit before trying to read the whole word.

Four pairs to recognise

LettersSoundPractice wordMeaning
ου/u/, roughly the vowel in “food”μουmy / to me, depending on context
αι/e/, approximately the vowel in “bed”καιand
ει/i/, roughly the vowel in “see”είμαιI am
οι/i/, the same vowel sound as ειφίλοιfriends

The English comparisons are approximations, not instructions to copy English vowel length. The symbols between slashes describe sounds. The written pairs ει and οι sound alike here, but they are not interchangeable spellings.

Read in three passes

  1. Find and underline the pair: μου, και, είναι, φίλοι, κουτί.
  2. Find the stress mark. In κουτί, the last syllable is stressed; in φίλοι, the first is stressed.
  3. Read the word without giving each letter of the pair its own sound.

Try είμαι slowly: ει gives /i/ and αι gives /e/. The first syllable is stressed. You can read both parts using this table, even though the spelling contains four vowel letters.

Practice without looking at the table

Write the sound /u/, /e/ or /i/ for the highlighted pair:

  1. μου
  2. και
  3. φίλοι
  4. είμαι
  5. κουτί
  6. είμαι
Check your answers

1. /u/. 2. /e/. 3. /i/. 4. /i/. 5. /u/. 6. /e/. Notice that είμαι contains two different pairs, each representing one vowel sound.

Do not extend the rule to every pair

This worksheet covers ου, αι, ει and οι. The combinations αυ and ευ follow a different pattern involving a consonant sound. Two dots above a vowel—the diaeresis—can also signal that adjacent vowels are read separately. When you meet an unfamiliar pattern, check it rather than assuming every two vowels make one sound.

Your next reading task

Cover the meanings and read μου, και, είμαι, φίλοι, κουτί again in a different order. Then write a new example beside each pair as you encounter it in a lesson. Recalling the sound from the Greek spelling is the aim; memorising an English transcription is not necessary.

Need to review individual letters? Use the Greek alphabet reference or the printable alphabet chart. Continue with the alphabet lesson to practise letters and combinations together.

Next: practise αυ and ευ, including when to say v or f.

Practise now

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