Hey all!!! Thank you very very much for the quick answer
s 
 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, 
will it work? 
Like:
Я ещё не был в Москве, но я знаю, что Москв
а большой город.