The following video demonstrates each syllable of the pinyin structure
and the exercise of pinyin/zhuyin with basic Chinese 4-tune pronunciation

Mandarin pinyin tunes
Click the framed calligraphic Chinese symbol icons
to link more related multi-character Chinese words!

nēi, néi, něi, nèi

third tune

něi

loss of courage dispirited; low-spirited 餒 něi

become discouraged discouraged; lost heart 氣餒 qì něi
air 氣 qì	low-spirited 餒 něi

fourth tune

nèi

inner; inside 內 nèi

inside and outside 內,外 nèi wài
inside 內 nèi	outside 外 wài