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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nā, ná, nǎ, nà

second tune

ná

take; seize hold; grasp 拿 ná

third tune

nǎ

how where; what; which 哪 nǎ

fourth tune

nà

that 那 nà

accept; receive 納 nà

accept willingly 接納 jiē nà
receive 接 jiē	accept 納 nà

Chinese characters also pronunced nà