Today one of my students asked how to pronounce 1906. Was it “nineteen six” or “nineteen oh six”? He recognized the pattern that in English we tend to read four-digit years as a pair of 2-digit numbers. “Nineteen six” didn’t sit right with him though. This is probably because when he learned to tell time in English, he learned that 2:03 is “two oh three”, not “two three”. So he asked about the years.