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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dān, dán, dǎn, dàn

first tune

dān

medical pill 丹 dān

divine pill, elixir of life 仙丹 xiān dān
celestial being 仙 xiān	pill 丹 dān

single 單 dān

single; unmarried 單身 dān shēn
single 單 dān	body 身 shēn

burden; undertake 擔 dān

fret about; worry 擔心 dān xīn
burden; undertake 擔 dān	heart 心 xīn

indulge; delay 耽 dān

delay; impeded 耽誤 dān wù
indulge; delay 耽 dān	miss; error 誤 wù

Chinese characters also pronunced dān

third tune

dǎn

courage; gallbladder 膽 dǎn

courage; bravery 膽量 dǎn liàng
courage 膽 dǎn	amount 量 liàng

Chinese characters also pronunced dǎn

fourth tune

dàn

day; daybreak 旦 dàn

once; as soon as 一旦 yí dàn
once 一 yí	day 旦 dàn

New Year's Day 元旦 yuán dàn
first; primary 元 yuán	day; daybreak 旦 dàn

but 但 dàn

but 但是 dàn shì
but 但 dàn	is 是 shì

egg 蛋 dàn

chicken egg 雞蛋 jī dàn
chicken 雞 jī	egg 蛋 dàn

light taste or color 淡 dàn

thick or thin; dark or light 濃,淡 nóng dàn
thick; dense 濃 nóng	light taste or color 淡 dàn

pellet 彈 dàn

glass marbles 彈珠 dàn zhū
pellet 彈 dàn	bead 珠 zhū

birth 誕 dàn

born 誕生 dàn shēng
birth 誕 dàn	give birth to 生 shēng

Chinese characters also pronunced dàn