Breakdown of Кто-то стучит в дверь, а потом входит в кабинет.
дверь
door
а
and (contrastive)
в
in / to (direction)
кабинет
office (private room, study)
потом
then
входить
to enter
кто-то
someone
стучать
to knock (impf)
Questions & Answers about Кто-то стучит в дверь, а потом входит в кабинет.
Why do we use входит here instead of just идёт?
Входит is formed by adding the prefix в- (meaning in or into) to a verb of motion. While идёт just means someone is walking, входит specifically means enters or goes inside. This is exactly what you need when someone is stepping into an enclosed space like a кабинет.
Why is the word в repeated in входит в кабинет?
In Russian, when you use a prefixed verb of motion like входить (to enter), you almost always follow it with the matching preposition to point to the destination. Here, the prefix в- on the verb pairs with the preposition в (into) before the noun. The noun кабинет is in the accusative case because it is the destination of the movement.
Why does the sentence say стучит в дверь? In English, we knock ON a door.
Prepositions don't always match up perfectly between languages! In Russian, you literally knock into a door or window, so you must use the preposition в plus the accusative case for the target. Because дверь is a feminine noun ending in a soft sign, its accusative form looks exactly like its dictionary form.
What does the -то do in the word Кто-то?
Кто means who, and adding the suffix -то turns it into someone or somebody (кто-то). You use -то when an action is happening in reality and you know a person is doing it, but you just don't know their identity. If you were asking a hypothetical question like 'Is anyone there?', you would use кто-нибудь instead.
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