A very wise person once conjectured about the relative merits of teaching children individual sounds in isolation before allowing them to speak. Only after a child had demonstrated mastery of phonemes (sound units) could s/he be allowed to advance to morphemes (meaning units). Thought units (T units or sentences) would follow. Under such a highly structured, individualized learning program, students could easily learn to say, "I hate school," by the end of second or third grade (depending on intelligence, socio-economic status, and motivation of course).
Prendergast, J. F. (1979). Overskill. Reading Horizons, 19 (2). Retrieved from https://scholarworks.wmich.edu/reading_horizons/vol19/iss2/6