upon
The German word 'auf' is used in a similar way to the English word 'upon'. It is often used to indicate a position or location, especially when something is on top of something else. For example, 'Das Buch liegt auf dem Tisch' translates to 'The book is upon the table' in English.
I am waiting for the bus.
In this example, 'auf' is used to convey the concept of waiting for something or someone. This is a very common use of 'auf' in the German language.
He is studying at the university.
Here, 'auf' is used to denote a location where an activity is taking place. It corresponds to the English preposition 'at' when referring to institutions or places.
She sits down on the chair.
In this example, 'auf' is used to indicate the surface upon which an action is performed. In this case, the chair is the surface where the action of sitting down is taking place.