ng vs n

/ng/
singer +er
hanger +er
banging +ing
sing+ing
spring+y
string+y
dung+y
wing+y

/ng g/

finger
linger
bangle

long-ger
strong-ger
young-ger

http://www.phon.ucl.ac.uk/home/wells/yorksdial.htm

http://en.wikipedia.org/wiki/Phonological_history_of_English_consonants#Ng-coalescence