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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to link more related multi-character Chinese words!

rēng, réng, rěng, rèng

first tune

rēng

throw away; cast aside 扔 rēng

second tune

réng

still; yet 仍 réng

still; yet remain unchanged 仍然 réng rán
still 仍 réng	like that 然 rán