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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to link more related multi-character Chinese words!

sōu, sóu, sǒu, sòu

first tune

sōu

search; search out 搜 sōu

decayed; rotten rancid; spoiled; soured stupid; idiotic; foolish 餿 sōu

lousy idea; rotten idea 餿主意 sōu zhǔ yì
rotten; foolish 餿 sōu	idea 主意 zhǔ yì

Chinese characters also pronunced sōu

third tune

sǒu

elder; senior; old gentleman 叟 sǒu

Chinese characters also pronunced sǒu

fourth tune

sòu

cough 嗽 sòu

cough 咳嗽 ké sòu
cough 咳 ké	cough 嗽 sòu