Which one? The rhenish regiolect version of the continous aspect, or the standard German construct with 'gerade'? I wouldn't blame your German teacher - Personally, I wasn't aware that German
had a 'continous aspect', nor that my local people used a different one, until I stumbled upon this Wikipage a couple years ago. None of my teachers pointed out to us that German
had a 'Verlaufsform'. I only noticed, while learning Dutch, that certain constructs appeared odd to me, but
oddly familiar at the same time - likely because I had heard similar constructs used in my neck of the woods.
Might also depend on
where your teacher learned German - this is one of the regiolects spoken in parts of Northrhine-Westphalia, the state that borders both Belgium and the Netherlands. Small wonder we Rhenish folk would 'borrow' stuff from our neighbors (aka "you guys"). Otoh, Northrhine-Westphalia
alone has the same population size as the Netherlands ... so it's big enough that 'we' can harbour delusions about our speaking 'proper' standard German. Other Germans ... might regrettably (and erronously
) beg to differ. The 'thing about Germans' is ... there's rather a lot of us, yknow?
(Or when they learned it - in '96, Switzerland, Austria and Germany sat down and agreed on an updated specification of Standard German. Doesn't mean everybody outside the chattering classes feels honour-bound to use it at all times).In my hometown, nobody would look askance at you for
mixing both 'continous aspect forms', eg: "Ich bin gerade am Lesen" (roughly "Ik ben
nu(!!) aan het lezen" - "I am at (the) reading right now"). You might even throw in a 'jetzt' ('now') for good measure without anybody batting an eye: "Ich bin jetzt gerade am Lesen" ("I am now
rightnow at (the) reading") - that'd be
double redundancy. And everbody would insist that this is indeed proper standard German. Until we meet some poor Germans from another region, who also believe that
their regiolect is "Proper High German".
We also code-switch a lot between formal- and casual speech, and tend mix our regional dialects into our speech subconsciously - in many social settings, standard German might feel outright stilted, in others, it'd feel boorish not to use it.
TL;DR - The 'thing about German' is that Germans
actually believe it is
one language.