<ul><li> bei (auf)</li><li>dich (euch (because you are talking to a community))</li><li>Worte I am guessing that you like learning about expressing oneself in a certain language? It's a bit tricky. I would maybe say "Ich interessiere mich für Sprachen" (languages)</li><li>Ich bin (es ist) you yourself cannot be a hobby :) </li><li> weiter nachdenken(darüber nachdenken (or maybe: mich dafür interessieren))</li><li>Die Beziehung zwischen Worten und Gedanken ist interessant. -> for this part I would say it's difficult to say whether it should be "Wörter" or "Worte" because in the context both would work. </li><li>verschiedene(n) Sprachen.</li><li>Heidegger prägte (beschrieb/erklärt) das Wort Dasein, um zu glauben (mit dem Gedanken), dass sich Menschen deutlich von anderen Wesen unterscheiden, -> prägen would mean he made the word into what it is today. But many people won't know his concept of the word, so it has not been "geprägt". I would say he described the word "beschrieb". </li><li>Es tut uns (mir)leid</li><li>Als ich studieren wollte, beschloss ich, für kurze Zeit zu studieren. -> I am guessing that this is a confusion of words? It probably is supposed to be "lernen" as you wanted to say, that you were studying German for a bit. In German studying should usually be translated to "lernen". "Studieren" is only for something you'd study in University! :)</li><li>Diesmal ließ ich den Computer die Sätze (vor)lesen, die ich gemacht (geschrieben) hatte,</li><li>und ich habe ein wenig <s style="background-color: rgb(250, 204, 204);">über</s> das Alphabet lernen</li><li>und hart (fleißig) lernen -> again something that is very different from English: We never say "study hard" we only say "study diligently"</li></ul>