to get up / be open
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to get up
To rise from a lying or sitting position into a standing position, especially to leave bed in the morning.
Ich muss morgen früh aufstehen, weil ich einen Termin habe.
I have to get up early tomorrow because I have an appointment.
to stand up
To stand up for a cause or person, or to protest or rebel against something.
Die Bürger sind gegen die ungerechten Gesetze aufgestanden.
The citizens stood up against the unjust laws.
to be open
To be open and not closed, usually referring to doors, windows, or lids.
Bitte schließ die Terrassentür, sie steht schon den ganzen Tag auf.
Please close the patio door; it has been open all day.
'Aufstehen' (to get up / to be open) is a separable verb. The prefix 'auf' comes at the end in main clauses. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Jeden Morgen stehe ich um sechs Uhr auf.
Every morning I get up at six o'clock.
The perfect tense of 'aufstehen' is always formed with the auxiliary verb 'sein'. The reason is that the verb describes a change of position or state.
Ich bin heute erst um 10 Uhr aufgestanden.
I didn't get up until 10 o'clock today.
In the meaning 'to protest' or 'to stand up for something', 'aufstehen' is almost always used with a preposition: 'für etwas' (for something, positive) or 'gegen etwas' (against something, negative).
Die Mitarbeiter sind für bessere Arbeitsbedingungen aufgestanden.
The employees stood up for better working conditions.
When it is about open doors or windows, 'aufstehen' describes a state, not an action. The subject is the door or window that is open.
Das Fenster im Wohnzimmer steht seit Stunden auf.
The window in the living room has been open for hours.
to raise / levy
Both words can express someone moving from a sitting or lying position to a standing position. „Aufstehen“ is the normal, everyday choice, while „sich erheben“ sounds considerably more elevated or ceremonial. In ordinary situations, „aufstehen“ is usually the better fit; in ceremonial language, „sich erheben“ can also be used.
Als der Bus kam, standen alle Fahrgäste von ihren Plätzen auf.
When the bus arrived, all the passengers got up from their seats.
Als der Ehrengast den Raum betrat, erhoben sich alle Gäste von ihren Plätzen.
When the guest of honor entered the room, all the guests rose from their seats.
