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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rān, rán, rǎn, ràn

second tune

rán

like that; just so 然 rán

natural; naturally free from affectation 自然 zì rán
self 自 zì	like that 然 rán

certainly; definitely of course; as it should be 當然 dāng rán
regard as 當 dāng	like that 然 rán

burn; ignite 燃 rán

burn; flaming; combustion 燃燒 rán shāo
burn; ignite 燃 rán	burn 燒 shāo

Chinese characters also pronunced rán

third tune

rǎn

dye (color) 染 rǎn

dyeing; coloring 染色 rǎn sè
dye 染 rǎn	color 色 sè

Chinese characters also pronunced rǎn