Let me open a topic for Colloquial Tamil only. I will be introducing some phrases and words written in Latin script and with pronunciations in brackets indicated with IPA (phonetic symbols). It's mostly based on the Colloquial Tamil course
Basics
vaNakam ['vɐ̃ɳɐ̃kkɐ̃] - hello
peeru ['pe:rə] - name
en [jẽ(n)] - my
en peeru john [jẽm'be:ɾə dʒã:] - my name is John
naan john [nã: dʒã: ] - I'm John
aamaa [ã:'ma:] - yes
romba magizhcci ['rõmbɐ 'mahi(ɭ)tɕtɕɪ] - nice to meet you (lit.: great pleasure)
peerasiriyar [pe:'ɾasrijɐɾ] - professor
maaNavan ['mã:ɳɐ̃vɐ̃] - student
ooTTal ['o:ʈʈal] - hotel
konjam ['kõndʒɐ̃] - a little
ooyvu ['woojwə] - rest
ange ['ɐ̃ŋe] - there
niinga ['nĩ:ŋɐ] - you (plural and polite singular)
some verbs:
vaa [va:] or [wa:] - come
poo [po:] - go
eDu ['jeɖə] - take
eDunga ['jeɖə̃ŋɐ] - please take (polite imperative, niinga imperative of eDu)
As you can see, unstressed u is pronounced as [ə], and many times it's silent (not pronounced), especially at the end of the word, and especially if the word that follows it starts with a vowel:
ooyvu ['woojwə] (rest) + eDunga ['jeɖəŋɐ] (please take) =
please take rest ['woojweɖə̃ŋɐ]
(in connected speech ə of the first word and j of the second word disappeared)