As-salaamu-a-laykum…
Bismillaahir
rahmaanir raheem
if ‘Raa’ has “zabar” or ‘two zabar’ or “pesh” or ‘two pesh’ then ‘Raa’ is read to be ‘full mouth’.
if
‘Raa’ has “zer” or ‘two zer’ then ‘Raa’ is read lightly or empty mouth,
if
there is zabar or pesh befor ‘Raa sakin’ then ‘Raa sakin’ is read ‘full mouth’.

if
there is ‘zer’ befor ‘Raa sakin’ the then ‘Raa sakin’ is read lightly.
2. If you see a raw mushad-dad (raw with a tashdeed on
it) with a fatha (zabar) or dhamma (pesh) on it then it will be read full
mouth.
,
3.
If you see a raw mushad-dad with kasra (zer) on it then it will be read empty
mouth.
4.
If you are going to stop on a raw and before it there is a yaa saakin then read
the raw empty mouth.
5.
If after a raw saakin which has a kasra before it you see one of the 7 full
mouth letters then this will be read full mouth.