short as in 'man', or long as in 'half; never as in 'mane'
b
as in 'can'; never as in 'city'
as in "Bach" (the composer) or 'loch'; never as in 'church'
d
as "th" in "them"; never as in 'smith'
the a as in "sane" 
or "self"
or immediately following "a", the sound is "ee"
as "v" in "verb"
as "ff" in "effortl" or f in 'for'
as in "garden"; never as in 'gin'
as in "long"
as in "hat" (never silent)
short as in "tin" or long as in "tea"
as in "lift"
as in "Llanelli" .     This sound does not occur in English. Place the tongue on the roof of the mouth near the teeth, as if to pronounce "l", then blow voicelessly.
m
n
short as in "pond" or long as in "rose"
p
as ph in 'photo'; has same sound as the Welsh ff.
always trilled as in 'arrow'.
r followed by a strong emission of breath
s (as in "song"; never as in "as"
t
as in "cloth", never as in "that"
as the y in the English word 'hymn'
as oo in "fool"
as u in"run"; as in "tea" or "tin"

Note:  Welsh vowels = A E I O U W Y

The only consonants doubled in Welsh are N and R
The letters J K V X or Z never occur in pure Welsh words.