"You're learning fast, my friend!"
Translation:Du lernst schnell, mein Freund!
The present tense also called the simple present (Präsens) is used to talk about the present and future in German. We can translate it into one of three English tenses: the simple present, present progressive and future with will or going to. It is the most commonly used tense in the German language.
That means, direct translations from Präsens back to English will always be in the simple present tense. In this case:
Du lernst schnell, mein Freund!
You learn fast, my friend!