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!

xū, xú, xǔ, xù

first tune

xū

need want; require 需 xū

must; ought to 須 xū

weak; feeble empty; void; hollow 虛 xū

whiskers 鬚 xū

Chinese characters also pronunced xū

second tune

xú

slowly; gently; calmly 徐 xú

third tune

xǔ

allow; approve permit; promise 許 xǔ

Chinese characters also pronunced xǔ

fourth tune

xù

order; sequence 序 xù

continue join; connect 續 xù

rising sun 旭 xù

save; reserve 蓄 xù

describe; narrate 敘 xù

Chinese characters also pronunced xù