My favourite teacher ever was a substitute I had for two terms in tahun 5 when I was 9-10 years old. He was really nice but also made sure we learned something new at the end of the day, and he always found ways to make lessons fun. Best of all, he played the gitar and he'd sometimes play songs for us at the end of the day. He once wrote an Easter song, which we performed as a class in assembly that year. Those were a good couple of terms. :D
