Can we not combine "öğrenci ile" to "öğrencile"?
"öğrenciyle" If the last letter of the word is a vowel, we put "y". Examples: Kalem+ile=Kalemle, silgi+ile=silgiyle
So in this case, "öğrenciyle" would have been acceptable?
Then "öğrenciyle" looks like it is instrumental. Can konuşmak take instrumental indirect objects?
Well, the verb "to speak" doesn't take an indirect object in English either. You speak "with/to" someone, making it the object of a preposition.
Regardless, the verb "konuşmak" normally takes the instrument case. :)
Why is it not öğrenciyi here? Öğrenci should be in accusative no?
"ile" always takes the nominative case. Always :)
This sentence can also mean
"A teacher should talk with his students" as in giving counseling to them
I feel like this sentence should have a little bit of changes