you have to replace that with a
Sakin
(imagined), that Sakin (imagined) is called Arji Sakin.
For example, this word 
'Nastayi-nu' has damma (red) on last letter. Now if you want to stop on this word, you
have to replace red damma with an imagined sakin like
this 
and pronounce that as 'Nastayi-n'.
Exception: If there is
double fatha 
or Madd (click
here
to learn what is madd) this rule will not applicable.
or Madd (click
here
to learn what is madd) this rule will not applicable.
'Nastayi-nu' has damma (red) on last letter. Now if you want to stop on this word, you
have to replace red damma with an imagined sakin like
this and pronounce that as 'Nastayi-n'.
See examples below with 2 ayah from Sura Fatiha and how to read those
with or without arji sakin.
