A raa (ر) with a Fathah (َ) or Dammah (ُ) on it should be pronounced with a full mouth
رَ
فَمَا رَبِحَت تِّجَٰرَتُهُمْ
رُ
كَيْفَ تَكْفُرُونَ بِٱللَّهِ وَكُنتُمْ أَمْوَٰتًا فَأَحْيَٰكُمْ
A raa (ر) with a Kasrah (ِ) should be pronounced with an empty mouth.
رِ
ذَٰلِكُمْ خَيْرٌ لَّكُمْ عِندَ بَارِئِكُمْ فَتَابَ عَلَيْكُمْ
رِ
ثُمَّ يُحَرِّفُونَهُۥ مِنۢ بَعْدِ مَا عَقَلُوهُ وَهُمْ يَعْلَمُونَ
If a Fathah (َ) or Dammah (ُ) appears before a Raa Saakin (رْ), the Raa Saakin will be pronounced with a full mouth
َ رْ
وَهُوَ ٱلَّذِى خَلَقَ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضَ فِى سِتَّةِ أَيَّامٍ وَكَانَ عَرْشُهُۥ
ُ رْ
وَإِنَّكَ لَمِنَ ٱلْمُرْسَلِينَ
ِ رْ
أَمْ لَمْ تُنذِرْهُمْ لَا يُؤْمِنُونَ
If a Shaddah (ّ) appears on the letter Raa (ر) and has either a Fathah (َ) or Dammah (ُ) it will be pronounced with a full mouth.
رَّ
لَّيْسَ ٱلْبِرَّ أَن تُوَلُّوا۟ وُجُوهَكُمْ قِبَلَ ٱلْمَشْرِقِ وَٱلْمَغْرِبِ وَلَٰكِنَّ ٱلْبِرَّ
رُّ
وَمَآ أَظُنُّ ٱلسَّاعَةَ قَآئِمَةً وَلَئِن رُّدِدتُّ
If a Shaddah (ّ) appears on the letter Raa (ر) and has a Kasrah (ِ), it will be pronounced with an empty mouth.
رِّ
وَهُوَ ٱلَّذِى جَعَلَ لَكُمُ ٱلنُّجُومَ لِتَهْتَدُوا۟ بِهَا فِى ظُلُمَٰتِ ٱلْبَرِّ وَٱلْبَحْرِ
When a Yaa Saakin (يْ) appears before a Raa Mouquf and the letter preceding the Yaa Saakin has a Kasrah (ِ), then the Raa (ر) will be recited with an empty mouth.
ِ يْ
وَٱللَّهُ بِمَا تَعْمَلُونَ خَبِيرٌ
ِ يْ
وَمَن يَزِغْ مِنْهُمْ عَنْ أَمْرِنَا نُذِقْهُ مِنْ عَذَابِ ٱلسَّعِيرِ
ِ يْ
إِنَّهُۥ هُوَ ٱلسَّمِيعُ ٱلْبَصِيرُ
ِ يْ
وَٱلزُّبُرِ وَٱلْكِتَٰبِ ٱلْمُنِيرِ
When a letter other than a Yaa Saakin (يْ) appears before a Raa Mauquf, and the letter has a Sukoon ( ْ) on it and the letter preceding it has either a Fathah (َ) or Dammah (ُ) on it, then the Raa (ر) will be recited with a full mouth.
َ بْ
وَتَوَاصَوْا۟ بِٱلْحَقِّ وَتَوَاصَوْا۟ بِٱلصَّبْرِ
ُ سْ
إِنَّ ٱلْإِنسَٰنَ لَفِى خُسْرٍ
