Hey all!!! Thank you very very much for the quick answer It helped me a lot, and I see what mistakes I made. In the sentence with the class, I forgot the word "висит". So it's "В классе висит расписание". I think this would be correct?

Also the last sentence is (in german):
Ich war noch nicht in Moskau. Aber ich weiß, dass Moskau eine große Stadt ist.

in English:
I haven't been to Moscow yet. But I know, that Moscow is a big city.


So if I write it with a comma, does it work?
Like:
Я ещё не был в Москве, но я знаю, что Москву большой город.


And would it better to write:
У Москы есть Кремль, музеи, школы, библиотеки, ...
?