Chinese · Pronunciation Guide
yo-byen: a hard-falling first syllable, then a weak toneless suffix. The mirror of 左边 in meaning, and identical in structure.
yòubian
Fall then nothing, so the word is heavy-light. Unlike 左边, whose first syllable is a third tone and therefore vulnerable to conversion, this one is tonally inert on both sides: nothing changes it and it changes nothing except the negator, which becomes bú before it.
Listen: 右边
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银行在右边。
Yínháng zài yòubian.
The bank is on the right.
Listen: 银行在右边。
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银行在右边。 gives yín rising, háng rising again, zài falling, yòu falling, and bian fading. Two rises then two falls then a weightless tail — a very clean arch shape. The bank climbs and the direction drops, which is a useful way to remember the contour rather than the individual tones.
Levelling or dipping the first syllable converts "right side" into something built on 有 yǒu instead. The fall must be decisive. Beyond that, learners restore a full first tone to bian, giving two equal beats where the second should be almost thrown away, and the -ian final opens out to "byahn".