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.
'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
'sich erheben' and 'aufstehen' can both mean that someone moves from a sitting or lying position into a standing position. 'Aufstehen' is the normal everyday word, especially in the morning or when you get up from a chair. 'Sich erheben' sounds more formal or ceremonial and is more likely to be used in special situations, for example in a meeting or assembly. Both words can also mean that people protest or rebel against something. Here too, 'aufstehen' is more direct and modern, while 'sich erheben' sounds stronger and more elevated in style. The risk of confusion lies in the fact that the basic movement is similar. In everyday language, 'aufstehen' is usually more natural.
Mein Kollege steht am Montag immer sehr früh auf.
My colleague always gets up very early on Mondays.
Als die Richterin den Saal betrat, erhoben sich alle Anwesenden.
When the judge entered the courtroom, everyone present rose.