Chinese · Pronunciation Guide
hai, low and sagging, with a scraped h onto the wide diphthong of "eye".
hǎi
The neighbour decides. Compare 还 hái, a rising tone with identical segments, and 害 hài, a falling one — three common words built on the same syllable, separated purely by pitch direction. That crowded neighbourhood is why the dip has to be genuine rather than merely low-ish.
Listen: 海
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夏天我们去看海。
Xiàtiān wǒmen qù kàn hǎi.
In summer we go to the sea.
Listen: 夏天我们去看海。
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夏天我们去看海。 ends on hǎi, so the dipping tone can be fully realised with its final lift. Wǒ is protected by the toneless men and keeps its dip too. Before that, xià plunges, tiān holds level, qù and kàn both plunge. Three falls and two dips, with no conversions anywhere.
The h vanishes for many learners, leaving "I". Add friction at the back of the mouth. On the tone side, the risk is producing something between a dip and a fall — and since hài is a real word, a half-hearted descent that starts high genuinely changes the meaning. Start low and stay low.