Breakdown of Врач всегда прикрывает дверь кабинета.
дверь
door
врач
doctor
всегда
always
кабинет
office (private room, study)
Questions & Answers about Врач всегда прикрывает дверь кабинета.
How does the prefix при- change the meaning of the action in this sentence?
The prefix при- here adds an attenuative (softening or partial) meaning to the base verb. Instead of fully closing or shutting the door (закрывать), прикрывать means to close it only slightly, gently, or partially.
Since prefixed verbs are usually perfective, why is прикрывает imperfective here?
While adding a prefix like при- to a simple verb normally creates a perfective verb (like прикрыть), this sentence requires an imperfective verb because the word всегда (always) indicates a repeated, habitual action. Прикрывает is the imperfective form derived from the perfective прикрыть.
Why is the word for office (кабинет) in the genitive case (кабинета)?
It is in the genitive case to show possession or relationship, translating literally to "the door of the office". In Russian, this noun-modifying-noun relationship is handled by putting the second noun in the genitive.
I know дверь is the direct object, so why doesn't its ending change for the accusative case?
Дверь is indeed in the accusative case here. However, because it is an inanimate feminine noun ending in a soft sign (belonging to the 3rd declension), its accusative form is completely identical to its nominative form.