Кто-то решил лечь на пол.

Questions & Answers about Кто-то решил лечь на пол.

Why do we use the Accusative case in на пол instead of the Prepositional на полу?
Because the verb лечь (to lie down) involves movement towards a destination to assume a new position. We use на + Accusative to mean 'onto the floor'. If someone was already lying there and not moving, you would use the static verb лежать with the Prepositional case: лежать на полу.
лечь is the perfective verb for 'to lie down'. Why does it end in -чь?
While most Russian verbs end in -ть, a few older verbs end in -чь, like лечь and мочь (to be able to). Since лечь is irregular, it is helpful to memorize its past tense forms: лёг (masculine), легла (feminine), and легли (plural).
Why is the verb решил masculine, if кто-то (someone) could be a woman?
In Russian, the base pronoun кто (who) and words built from it like кто-то are grammatically masculine singular. They always trigger masculine singular verb endings in the past tense, regardless of the actual gender of the person you are talking about.
Could we use кто-нибудь instead of кто-то in this sentence?
No, because кто-то refers to a specific, real person who did the action, even if we do not know their identity. Кто-нибудь means 'anyone at all' and is mostly used in questions, requests, or talking about the future. Since this is a completed past action, кто-то is required.

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