K is often converted into t, as ast, to ask, mast, a mask, bleat, bleak.
T is conversely often replaced by k, as masking, acorn-gathering, from 'mast,' while sleet becomes sleek, and pant, pank.
S usually takes the sound of z, as zee, to see, zaa, a saw, zowl, soul, zaat or zate, soft, zider, cider, zound, to swoon.
Thr usually becomes dr, as dree, three, droo, through, draish, to thrash.
In afurst, athirst, and fust, thirst, we still retain a very ancient characteristic of Southern English.
T is always dropped in such words as kept and slept, which become kep' and slep'.