English

Klas, profesor, koledzh: one consonant instead of two

Borrowed words give up their double consonants at the border: where English writes two letters, Ukrainian writes one. Klas, kasa, masa, profesor, koledzh, atestat, hryp, baroko, suma, grupa, plastmasa, komisiia. For example: “Професор читає лекцію (Profesor chytaie lektsiiu) в (v) аудиторії” — The professor is giving a lecture in the lecture hall. A rule from the Ukrainian course: worked out on examples, not memorized as a wording.

Updated September 1, 2026 · Lingofly

How it works

Borrowed words give up their double consonants at the border: where English writes two letters, Ukrainian writes one. Klas, kasa, masa, profesor, koledzh, atestat, hryp, baroko, suma, grupa, plastmasa, komisiia.

The exceptions are proper names and a few settled words: vanna, manna, Holandiia, Nitsa.

Native words are the opposite: there double consonants are alive and required. The parts of the word genuinely meet: zannia, zhyttia, pytannia, viddilennia, ozdoblemnia.

Two more habits of the same border. Greek and Latin words keep their i as i: istoriia, himnaziia, informatyka, dystsyplina, fizyka. And where other alphabets keep a special letter for the other e sound, Ukrainian does not. Plain e writes it: ekzamen, etap, efekt, epokha.

Table

Klas, profesor, koledzh: one consonant instead of two
with doublesin Ukrainianwhat changed
classklasa single s
professorprofesora single s
historyistoriiathe i of Latin roots
effectefektplain e, one f
knowledgezanniaa native nn stays

By example

  • Професор читає лекцію в аудиторії
    Profesor chytaie lektsiiu v audytorii
    The professor is giving a lecture in the lecture hall
  • Наш клас складається з двадцяти учнів
    Nash klas skladaietsia z dvadtsiaty uchniv
    Our class has twenty students
  • Іспит з інформатики буде у червні
    Ispyt z informatyky bude u chervni
    The computer science exam is in June

How the rule settles in your head

A rule is not memorized from an explanation. It is memorized from an attempt to use it and a mistake — that is why the app delivers it mixed in with words, not as a separate lesson: it resurfaces exactly where you forgot it.

Frequently asked

Why it is klas and profesor, one s each?

Borrowed words give up their double consonants at the border: where English writes two letters, Ukrainian writes one. Klas, kasa, masa, profesor, koledzh, atestat, hryp, baroko, suma, grupa, plastmasa, komisiia.

What does it look like in a Ukrainian example sentence?

“Професор читає лекцію (Profesor chytaie lektsiiu) в (v) аудиторії” (Profesor chytaie lektsiiu v audytorii) — The professor is giving a lecture in the lecture hall. A rule is easier to test on sentences like this than to memorize as a wording: what surfaces in conversation is the sentence.

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