на

The preposition на is one of the most versatile words in Ukrainian. Its meaning changes based on the case of the noun that follows it:

• Static Location (Locative Case): Answers the question де? (where?). It is used for:
  • Surfaces: на столі (on the table).
  • Open spaces: на вулиці (on the street; outside).
  • Events/Activities: на концерті (at the concert), на уроці (at the lesson).
  • Specific institutions: на пошті (at the post office), на роботі (at work).
  • Compass directions: на півночі (in the north), на заході (in the west).
  • Musical instruments: грати на гітарі (to play the guitar).
  Note: For location inside a vehicle, use у/в (в автобусі). While на автобусі is commonly heard to express the method of travel, it is often considered colloquial. The Instrumental case (автобусом) is the standard literary form.
• Directional Movement (Accusative Case): Answers the question куди? (where to?). It is used when moving toward the locations mentioned above:
  • Я йду на роботу (I am going to work).
  • Поклади це на стіл (Put this onto the table).
• Time Expressions: Used in certain time phrases. Note that for "on the weekend", the standard literary form is у вихідні, while на вихідних is a common colloquialism. With the Accusative case, it expresses the intended duration of a result (often with verbs of motion): на тиждень (for a week, e.g., "I went there for a week"). It is also used for telling time, such as minutes past the hour: п'ятнадцять хвилин на другу (1:15, literally "fifteen minutes towards the second hour") or scheduling an event (на сьому годину).
• States and Conditions (Locative Case): Used to express being in a certain state or period: на пенсії (in retirement), на канікулах (on vacation).
• Purpose or Target (Accusative Case): Used to indicate what something is for: на сніданок (for breakfast).
• Frequency (Accusative Case): Used to express how often something happens: раз на тиждень (once a week).
• Comparisons and Differences (Accusative Case): Used to show by how much things differ: на два роки старший (two years older).
• Division and Parts (Accusative Case): Used when dividing or breaking things into parts: розрізати на дві частини (to cut into two parts).
• Mathematics (Accusative Case): Used for multiplication and division: множити на два (to multiply by two), ділити на три (to divide by three).
• Translation (Accusative Case): Used to indicate the target language when translating: перекладати на українську (to translate into Ukrainian). Note that modern editors often prefer using the Instrumental case without a preposition: перекладати українською.
• Verb Government (Accusative Case): Certain verbs and adjectives are often used with на followed by the Accusative case. Examples include чекати на (to wait for), дивитися на (to look at), хворіти на (to be sick with), сподіватися на (to hope for), перетворитися на (to turn into), and схожий на (similar to).
• Fixed Phrases: Used in many common adverbial and motivational phrases, such as на жаль (unfortunately), на щастя (fortunately), на прохання (at the request of), and на честь (in honor of).

Important Notes:

• Origin: When you go на (to) a place, you return з (from) it. In Ukrainian, з (and its variants із/зі) is the universal preposition for origin, pairing with both на and в/у.
• Unlike the preposition у/в, на does not change its form for euphony. It always remains на.
• Remember that when using the Locative case, certain consonants change before the ending -і (e.g., підлога becomes на підлозі). See consonant alternation for more details.