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!

kū, kú, kǔ, kù

first tune

kū

cry; sob; weep 哭 kū

withered 枯 kū

Chinese characters also pronunced kū

third tune

kǔ

bitter 苦 kǔ

fourth tune

kù

storehouse; warehouse 庫 kù

warehouse; storehouse 倉庫 cāng kù
warehouse 倉 cāng	storehouse 庫 kù

pants; trousers 褲 kù

trousers; pants 褲子 kù zi
pants; trousers 褲 kù	suffix 子 zi

cruel cool; awesome 酷 kù

cold-blooded; hardhearted 冷酷 lěng kù
cold 冷 lěng	cruel 酷 kù