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Questions & Answers about Можно спать здесь?
Why doesn't this sentence have a word for "I" or "one"?
Можно is a special impersonal word meaning "it is allowed" or "is it possible." When you pair it with an infinitive like спать (to sleep), you don't need a subject like "I" or "we". It literally translates to "Is it possible to sleep here?"
Does можно change its ending depending on who is asking?
No, можно never changes its form. Unlike regular verbs like хотеть (to want) which change endings for "I", "you", or "they", можно is an unchanging word. You just put it right before the infinitive verb.
Is this related to the verb мочь (can/to be able to)?
Yes, they share the same root, but they are used differently. You use the verb мочь for physical ability (like "I can lift this"), but you use можно to ask for permission or if something is generally allowed.
How do we know this is a question since the words are in the normal order?
In spoken Russian, questions without a question word (like who, what, or where) are made entirely with your voice. You just raise your pitch on the main word of the question, usually можно here. In writing, only the question mark gives it away!