toki pona has 9 consonants:

letter English example
j fjörd, yacht
k scorching, scrap (unaspirated)
l clap, slot (pronounced like a distingushed Brit)
m mat, impure
n know, gnat
p sporadic, spin (unasiprated)
s see, sign
t stall, stick (unaspirated)
w wait, award

and five vowels:

letter English example
a bath (Scottish accent)
e air (Standard American English)
i see (approximately)
o or (Standard American English)
u pool (Standard American English)

as seen above, toki pona’s letters follow the IPA, meaning j sounds kinda like a y.

toki