I'm getting the same brainglitch that I did from Loglan! But
this is fascinating stuff. But maybe you're right, and "teach"
should be the base form, and "learn" should be derived.
Truly it could be either way. One may seem more basic and the other
more derivable to us because of our English biases. Same with 'give'
and 'receive/accept'.
Backing off for a minute, I already have the preposition "ko," which I'm
thinking of doing away with and replacing with a verb, like "sila", meaning
towards or to. So let's use it as that form.
I think a general purpose preposition that means 'with respect to' and
serves simply to mark the second object of a ditransitive could be
useful. (For less common prepositional concepts, your
'verb-as-preposition' inclination is good, I think.) You know how you
have "sta" for 'be situated in the usual fashion given the context'?
"ko" could be redefined to 'with respect to in the expected fashion',
so it could serve in all these contexts:
I give the bone with respect to the dog
I take the bone with respect to the dog
This bone is different with respect to that bone (instead of trying to
decide if the preposition should be 'from' as in AmEng, 'to' as in
BritEng, 'than' as in OtherEng...)
But trying to avoid marking the second object other than by position
might be a mistake. Ceqli has very few signposts and so could suffer
from overdensity as Loglan does. It was the dense predicate place
structure that more than anything fuzzled me about Loglan.