noun
bank (financial institution), bench
A1
Bank (die) has two main meanings: a financial institution (plural Banken) and a bench, seat (plural Bänke). It's feminine. Note the different plurals and the umlaut for the bench form. Regular declension otherwise. No special prepositions; not a verb, so no auxiliary.
Examples
Die Reporter erwähnten die Bank, die gestern überfallen worden war, weil viele Kunden betroffen waren.
The reporters mentioned the bank that had been robbed yesterday because many customers were affected.
Wir sitzen auf der Bank im Park.
We're sitting on the bench in the park.
Ich zahle das Geld bei der Bank ein.
I'm depositing the money at the bank.
Details
Mnemonics
two pictures: a building with money for 'bank' and a wooden bench for 'bench'
die Bank — imagine a female banker (die) behind the counter
Notes
Bank can mean financial institution or a bench; context clarifies meaning.