Hindi · Pronunciation Guide
sub, with a colourless schwa and a voiced b that stays voiced right to the end.
sab
A short vowel closed by a consonant: heavy by position, but very brief in real time. Alongside the long-vowelled quantifiers nearby it should sound noticeably compact, and stretching it is the commonest rhythmic slip.
Listen: सब
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
मैंने सब कुछ कर लिया।
Maiṁne sab kuchh kar liyaa.
I did everything.
Listen: मैंने सब कुछ कर लिया।
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"Maiṁne sab kuchh kar liyaa" uses sab kuchh as a fixed pair meaning "everything," and the ergative maiṁne appears because kar liyaa is a perfective transitive. Kuchh has an aspirated छ, so a puff of air lands right between sab and kar.
Two small things drift. The vowel gets opened to "sahb," and the final b gets devoiced toward p, which is an automatic English habit at the end of a word. Keep the vowel neutral and let the voicing continue through the lip closure until you release it.