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
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qūn, qún, qǔn, qùn

second tune

qún

group 群 qún

crowd; group of people 人群 rén qún
people 人 rén	group 群 qún

skirt 裙 qún

skirt 裙子 qún zi
skirt 裙 qún	suffix 子 zi

long skirt 長裙 cháng qún
long 長 cháng	skirt 裙 qún