First thing I would like to point out is that `` is fundamentally wrong. I think you were looking for `` (Remember that is or "weak" verb).
In this case however, I think you would like to express gratitude for the person who taught you and thus stay polite. I would reach for either the active `` or passive `` depending on where you want to put the emphasis.
To express `about` the easiest is probably to use ``.
Thus something along the lines of :
* ``
* ``
Should do just fine. Note that I used `` instead of `` because the latter, at least in my opinion carries a notion of "canteen", thus a low-end place. Feel free to modify that part !