Answer:
1. In der Sporthalle gibt es am Montag ein Konzert.
2. wir müssen ein Ticket kaufen.
3. Wir kaufen Obst und Gemüse im Supermarkt.
3. Obst und Gemüse kaufen wir im Supermarkt.
3. Im Supermarkt kaufen wir Obst und Gemüse.
(yeah, all 3 versions are grammatically correct. you would choose one based on what you wanna point out most, depending on the context, like if its important that it's the supermarket and not the farmers market (first and second version), or that we buy fruits and vegetables, rather than meat something else (third version. but all would work.)
4. Den Karaoke-Club findest du in der 2. Stage.
4. In der zweiten Etage findest du den Karaoke-Cljb.
(never heard of a Karaoke-Club tough. is it like an after school activity?)
5. Er will die Ausstellung von Gustav Kimt besuchen
Note that some building blocks of sentences are fixed, but often you can very the sequence or even split a building block.
if you got any questions, feel free to ask everything.
Explanation:
I basically had to learn German since j was little. didn't choose, but it's my native language
