Chinese · Pronunciation Guide
lee, low and sagging. Short and simple to articulate; the entire challenge is keeping the pitch down where it belongs.
lǐ
In fast speech this often loses its tone altogether when it works as a location suffix — jiā li, fángjiān li — so you will hear it both with a clear dip and almost pitchless depending on the speaker's pace. When it does keep its tone and is followed by another third tone, the usual sandhi applies and it rises.
Listen: 里
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猫在房间里。
Māo zài fángjiān lǐ.
The cat is in the room.
Listen: 猫在房间里。
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猫在房间里。 ends on lǐ, which means the third tone can be fully realised: the sentence closes by sinking to the bottom and easing up. Before that, māo is high, zài falls, and fángjiān rises then levels. So the whole utterance is a long descent with a rise in the middle, and lǐ is the landing point.
Learners often produce a brisk, high "lee", which reads as a first tone. The remedy is to think of the word as heavy rather than quick. There is also a spelling trap: this same syllable with a different tone gives lì and lí, both common, so a mid-level or rising delivery genuinely changes what you have said. And keep the l forward — an English-style dark l makes the vowel sound retracted.