We talked about why English is difficult still for non-native speakers even when they have studied throughout their university careers. I work face to face with private students in Istanbul and many can explain the difference between verb tense's better than most native speakers. The difference being that there are so many small exceptions to most of the rules, and the way we use the small words like at, in, of - I am in the hospital.. I am ill and a patient staying in the hospital. I am at the hospital, = I am visiting there my father is ill or I am working there.
He is very open to different ideas about language learning..