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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cū, cú, cǔ, cù

first tune

cū

coarse; rough gruff; rude thick; not thin 粗 cū

Chinese characters also pronunced cū

second tune

cú

die; dead; death (classic Chinese symbol) 殂 cú

fourth tune

cù

vinegar 醋 cù

urge; urgent; hurry 促 cù

sudden; abrupt; unprepared 猝 cù

sudden death 猝死 cù sǐ
sudden 猝 cù	death 死 sǐ

Chinese characters also pronunced cù