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Questions & Answers about Schließt das Fenster!
Why does the verb end in -t here (Schließt)?
How would I say this formally instead?
If you were speaking to strangers, colleagues, or anyone else you use Sie with, you would use the formal command. For that, you use the infinitive (the dictionary form) and keep the pronoun: Schließen Sie das Fenster!
Is das Fenster in the accusative case here?
Yes! The window is the direct object (the thing being closed), so it takes the accusative case. Because Fenster is a neuter noun, its word for "the" is das in both the nominative (subject) and accusative (object) cases, so it doesn't look like it changed.
How would we know if they meant "Close the windows!" (plural)?