Breakdown of Мой брат спит, его не нужно беспокоить.
брат
brother
не
not
он
he / it (for a masculine noun) / it (for a neuter noun)
мой
my / mine
спать
to sleep
нужно
it is necessary
беспокоить
to disturb (someone's peace, cause worry)
Questions & Answers about Мой брат спит, его не нужно беспокоить.
Why do we use the imperfective verb беспокоить here instead of the perfective побеспокоить?
This is the core rule of negative obligations in Russian! After не нужно (no need to) or не надо (don't/no need to), we almost always use the imperfective infinitive. It emphasizes that the action shouldn't happen at all, rather than focusing on the result of the action.
Why is the word его placed before не нужно беспокоить instead of after it?
Russian word order is flexible, and pronouns are often pulled to the front of a clause to show what the topic is. By placing его first, the sentence smoothly connects to the first half: my brother is sleeping, and as for him, there is no need to disturb.
Is его the subject of the second clause?
No, его is in the accusative case here, acting as the direct object of the verb беспокоить (to disturb him). The phrase не нужно is an impersonal construction, meaning it doesn't have a grammatical subject. Literally, it translates to it is not necessary to disturb him.
Could I use не надо instead of не нужно in this sentence?
Yes, absolutely. Его не надо беспокоить means exactly the same thing. Не нужно can sometimes sound just a tiny bit softer or more formal, like there is no need to, whereas не надо is closer to a direct don't, but in everyday speech they are highly interchangeable.
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