Free English pronunciation class for Chinese speakers in Taiwan that combines the science of linguistics and with practice of pronunciation.
ALLOPHONES are AURAL ILLUSIONS Allophones are different sounds that map to the same perception. This is a very strong aural illusion. Most native speakers are quite surprised to discover this. See this interesting research paper on tonal allophones in Vietnamese.
A linguistic description of the modern Hanoi dialect. A description of the Vietnamese sound system for non-native speakers from the Vietnamese grammar handbook, Cẩm Nang Ngữ Pháp Tiếng Việt do GS Trần Ngọc Dụng biên soạn. Northern Vietnamese Intonation