Translation of cerebral in German

Sometimes you forget one word and this makes the entire sentence sound differently. That means that you need to read each email before sending it twice at least if you want to be on the safe side every time.
We have learned that some tenses, such as Present Tense are easier and not as complex as others. Is that right? In my opinion, tenses in English are much easier than in the Spanish language.
So you want to know what I'm doing? I am 22 years old and I am studying medicine at the university in Atlanta. I want to learn German because I have a German girlfriend. We want to get married.