Chinese · Pronunciation Guide
yee-YWEN: a high level first syllable, then a hard-falling second built on the rounded front ü.
yīyuàn
Level into falling, with no rule in play. The spelling deserves as much attention as the tone: yuan is not "ywan" with a w-glide but a rounded front vowel that opens out, and the same final appears in 元, 员 and 圆. Getting it wrong once means getting a whole family of syllables wrong.
Listen: 医院
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医院离这里远吗?
Yīyuàn lí zhèlǐ yuǎn ma?
Is the hospital far from here?
Listen: 医院离这里远吗?
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医院离这里远吗? contains a conversion in the middle: lǐ and yuǎn are adjacent dipping tones, so lǐ rises. Then ma fades toneless. Note that 远 yuǎn in this sentence has a dipping tone while 院 yuàn in the word itself falls — the same final with two different tones, side by side in one sentence.
"Ywan" with a plain w-glide is the standard error for the second syllable, and it produces a vowel Mandarin does not use here. The tongue must stay forward while the lips round. The other issue is the zhèlǐ yuǎn conversion, which crosses a word boundary and is therefore exactly the kind learners overlook.