Questions & Answers about Открой окно, если в комнате душно.
Why is Открой used here, and what does it mean grammatically?
Открой is the imperative (command/request form) of открыть (to open, perfective aspect). It addresses one person informally (ты implied). It means Open (it)! / Open (the)…! as a single, completed action.
Why is the verb открыть perfective here—could it be открывай instead?
Yes, both are possible, but the nuance changes:
- Открой окно (perfective) = open the window (once), achieve the result (window becomes open).
- Открывай окно (imperfective imperative) can sound like start opening / be opening or do it regularly/whenever (more process/habit/ongoing feel), and can also be used as a softer “go ahead and open it” depending on context. In this sentence, the idea is usually a one-time action triggered by a condition, so Открой fits well.
What’s the difference between окно and окна or окну here—what case is окно?
Окно here is accusative singular, which for neuter nouns like окно looks the same as nominative: окно. It’s the direct object of Открой (open what? → the window).