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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cā, cá, cǎ, cà

first tune

cā

wipe; erase rub; scrub; polish 擦 cā

wipe clean; wipe down 擦乾淨 cā gān jìng
wipe 擦 cā	clean 乾淨 gān jìng