Kommt, wir setzen uns auf diese Bank.
die Bank, die Bänke is a bench in the park.
Shouldn't it be: auf dieser Bank ? Isn't it a strong adj. ending as to this Wikibook article?
German Language Stack Exchange is a bilingual question and answer site for speakers of all levels who want to share and increase their knowledge of the German language. It's 100% free, no registration required.Sign up to join this community
In German, we have the two verbs sitzen and setzen that both translate to the English to sit. Sitzen is used when you are already sitting at the location, which is why it demands the dative case:
Wo sitzt ihr? – Wir sitzen auf dieser Bank.
(Where do you sit? – We are sitting on this bench.)
Setzen, in contrast, is used to express that you are going to sit down, that is, you fulfill a movement towards the place. Therefore, setzen demands the accusative case:
Wohin setzt ihr euch? – Wir setzen uns auf diese Bank.
Where do you sit (down)? – We are sitting (down) on(to) this bench.
Notice that dies is not an adjective but a demonstrative pronoun, which is why the rules of strong/weak/mixed adjective declension do not apply here.