Chinese · Pronunciation Guide
Like the English word "eye", said with a hard falling pitch. No consonant at all — the vowel and the drop are the entire syllable.
ài
A single fourth tone. Because the syllable begins with a bare vowel, it tends to run into whatever precedes it, and speakers often insert a very slight glottal separation to keep it distinct. 不爱 becomes bú ài, since the falling tone triggers the negator's change.
Listen: 爱
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我爱你。
Wǒ ài nǐ.
I love you.
Listen: 我爱你。
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我爱你。 is three syllables spanning the full pitch range: wǒ sinks low, ài leaps to the top and plunges again, nǐ dips at the end. Wǒ keeps its full third tone because ài is falling, not dipping. The result is a sentence shaped like a V with a spike in the middle — and flattening that spike is what makes the phrase sound perfunctory.
English speakers give it the level, drawn-out delivery of the English word "eye", which loses the tone completely. It must drop decisively. The other issue is the onset: since English does not comfortably begin words with a bare vowel, learners insert an "h" or a glottal stop that is heavier than the light separation Mandarin uses. Start the vowel cleanly and immediately.