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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kōu, kóu, kǒu, kòu

first tune

kōu

stingy; miserly 摳 kōu

third tune

kǒu

mouth opening; entrance 口 kǒu

flavor appetite of taste 口味 kǒu wèi
mouth 口 kǒu	taste; flavor 味 wèi

Exit out of mouth 出口 chū kǒu
out 出 chū	mouth; opening 口 kǒu

Entrance into the mouth 入口 rù kǒu
enter; into 入 chū	mouth; opening 口 kǒu

fourth tune

kòu

buckle; hook up cut; deduct 扣 kòu

attach with a hook fasten with a hook 扣住 kòu zhù
buckle; hook 扣 kòu	stop 住 zhù

discount 折扣 zhé kòu
discount 折 zhé	cut; deduct 扣 kòu

call; knock kowtow 叩 kòu

bow in salute kowtow in salute 叩拜 kòu bài
kowtow 叩 kòu	worship 拜 bài

bandit enemy 寇 kòu

Chinese characters also pronunced kòu