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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yūn, yún, yǔn, yùn

first tune

yūn

dizzy; giddy; faint 暈 yūn

Chinese characters also pronunced yūn

second tune

yún

say; said 云 yún

cloud 雲 yún

even; smooth divided evenly; well-balanced; well mixed 勻 yún

Chinese characters also pronunced yún

third tune

yǔn

allow; permit 允 yǔn

Chinese characters also pronunced yǔn

fourth tune

yùn

pregnant 孕 yùn

pregnant woman expectant mother; mother-to-be 孕婦 yùn fù
pregnant 孕 yùn	woman 婦 fù

transport; apply fate; luck; fortune 運 yùn

motion; movement sports; athletics; exercise 運動 yùn dòng
transport 運 yùn	move 動 dòng

rhyme; vowel 韻 yùn

Chinese characters also pronunced yùn