Talking About Things: The "О" Prepositional Case

1. The Prepositional Case for "Topic of Speech or Thought"

So far, you've used the prepositional case for place. Its other primary job is to indicate the topic or subject of a conversation, thought, dream, book, or movie. The key preposition that signals this meaning is о, which means "about" or "of."

Common verbs that use this construction include:

• говори́ть о... (to talk about...)
• ду́мать о... (to think about...)
• чита́ть о... (to read about...)
• писа́ть о... (to write about...)
• мечта́ть о... (to dream about...)

Let's begin with a video that introduces this concept.

As you heard, to talk about something, you put the word for that thing into the prepositional case, following the preposition о.

2. The Forms of о: о, об, обо

The preposition о is straightforward, but like a few things in Russian, it has variations to make pronunciation smoother. The meaning is always the same.

Here is a summary of the rules:

• Обо is used before мне (me): обо мне (about me). It's a special case you just need to memorize.
• Об is used before words starting with the vowels а, о, э, и, у.
  • об и́гре (about the game)
  • об а́вторе (about the author)
• О is used in all other cases: before consonants and before the "yotated" vowels е, ё, ю, я (which start with a consonant [y] sound).
  • о фи́льме (about the film)
  • о му́зыке (about music)
  • о я́блоке (about the apple)

Let's listen to these rules explained to reinforce your understanding.

3. Asking "About What?" and "About Whom?"

To have a conversation, you need to be able to ask questions. In English, we put "about" at the end of the sentence: "What are you talking about?". In Russian, the preposition comes first, and the question word itself changes.

• что (what) becomes о чём? (about what?)
• кто (who) becomes о ком? (about whom?)

This next video clip explains this very clearly.

4. Putting It All Together: Verbs, Nouns, and Pronouns

Now we have all the pieces. We know the preposition о, the questions о чём? / о ком?, and the noun endings from previous lessons. Let's start building sentences related to your interests.

First, let's look at a rich list of verbs and nouns that commonly use this structure.

Using that vocabulary, we can now form sentences relevant to you:

• О чём э́та кни́га? (What is this book about?)
  • Э́та кни́га о нау́чной фанта́стике. (This book is about science fiction.)
• О чём вы говори́те? (What are you talking about?)
  • Мы говори́м о но́вой видеоигре́. (We are talking about a new video game.)
• О ком он пи́шет? (Whom is he writing about?)
  • Он пи́шет об изве́стном худо́жнике. (He is writing about a famous artist.)

Here are the personal pronouns in the prepositional case. The table from the Mango Languages article (and the image above) is your best reference.

Example: Он ду́мает о ней. (He is thinking about her.)

5. Check Your Understanding

Let's practice what you've learned. Provide the Russian answers for the following prompts.

1. Your friend asks you: "О чём ты чита́ешь?" You are reading an article about chemical engineering (хими́ческая инжене́рия).
2. Complete the sentence: "Я люблю́ смотре́ть фи́льмы ______" (I love watching movies about...). Choose one: живо́тные (animals, pl.), исто́рия (history), иску́сство (art).
3. How would you ask: "What are you dreaming about?" (using the informal 'you'). The verb for "to dream" is мечта́ть.
4. Answer the question: "О ком ты ду́маешь?" (Whom are you thinking about?). Answer: "I'm thinking about you (plural/formal)."
5. A friend says: "Я чита́ю но́вую кни́гу." (I am reading a new book). You want to know what it's about. What do you ask?

Conclusion

Отлично! You have now unlocked a huge part of the Russian language. You've moved beyond describing concrete locations and can now venture into the world of ideas, topics, and interests.

Key Takeaways:

• The prepositional case is used with the preposition о to mean "about a topic."
• о changes to об before most vowels and обо before мне.
• The key questions are О чём? (About what?) and О ком? (About whom?).
• Many verbs related to thinking, speaking, and reading use this о + prepositional structure.

Preview of the next lesson:
You've done a wonderful job with the prepositional case. In our next module, we will begin exploring the Dative case. This is the case of giving and receiving. It will allow you to say things like "I like movies" (Мне нра́вятся фи́льмы), express your age, and talk about who you are helping or calling. Get ready for another big leap in your conversational ability