In Russian, infinitive phrases can do many things in longer sentences. They are especially handy in subordinate clauses. Knowing how to use these phrases makes your sentences clearer and more interesting. Here are some important ways to use infinitive phrases:

1. As the Subject:
   Infinitive phrases can be the main part of the sentence. This helps you share your ideas more clearly.

   • Example: "Учить русский язык – это интересно." (To learn Russian is interesting.)

2. As a Direct Object:
   Sometimes, they tell us what the action of the verb is about.

   • Example: "Я хочу изучать русский язык." (I want to study the Russian language.)

3. As a Complement:
   Infinitive phrases can give more details about the subject or object.

   • Example: "Его мечта – стать врачом." (His dream is to become a doctor.)

4. To Show Purpose:
   Infinitives can explain why something happens. They often come before certain words.

   • Example: "Я пришёл, чтобы помочь тебе." (I came to help you.)

5. To Show a Condition:
   They can express a condition related to the verb in the main part of the sentence.

   • Example: "Если хочешь учиться, готовься к экзаменам." (If you want to study, prepare for the exams.)

6. To Show Concession:
   Infinitive phrases can express something surprising.

   • Example: "Несмотря на то что трудно, я продолжаю учить." (Even though it’s hard, I keep learning.)

7. To Indicate Time:
   They can show actions that depend on time in the main clause.

   • Example: "Я буду работать до тех пор, пока не закончу проект." (I will work until I finish the project.)

8. To Draw Attention:
   Infinitives can point out a specific goal or action.

   • Example: "Важно знать, что учить сложно." (It's important to know that learning is difficult.)

9. To Show a Result:
   Infinitives can explain what happens because of an action.

   • Example: "Я так устал, что не могу больше работать." (I am so tired that I can’t work anymore.)

10. To Show Contrast:
    They can highlight differences between two actions.

    • Example: "Я люблю читать, а ты предпочитаешь писать." (I love to read, but you prefer to write.)

Using these different roles, learners can create more complex and interesting sentences in Russian. This helps them understand the language better and express themselves more clearly.