Back fifteen years, my foster son came back from school and said his English teacher said you pronounced giraffe, giraffee because it has an e on the end. When he politely said it's giraffe she told him not to argue with her. He came second in a National English speaking contest and even now is called upon by his Thai international company to do their presentations for them. Perhaps his teacher should have listened to him. Until the Thai education system is elevated from marching, haircuts and dictatorial teaching, and encourages imaginative and lateral thinking, not much will change. But then it's not my country.