The first broad rule in this section is ghunnah on doubled nūn or doubled mīm, written نّ or مّ. In إِنَّ, the nūn is doubled; in ثُمَّ, the mīm is doubled.
Do not assume that every letter bearing shaddah requires ghunnah. The rule is specific to these two letters. Listen for nasal resonance while keeping the consonant and its vowel correct, without changing the word.
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Ghunnah in doubled nūn and mīm
The first broad rule in this section is ghunnah on doubled nūn or doubled mīm, written نّ or مّ. In إِنَّ, the nūn is doubled; in ثُمَّ, the mīm is doubled.
Do not assume that every letter bearing shaddah requires ghunnah. The rule is specific to these two letters. Listen for nasal resonance while keeping the consonant and its vowel correct, without changing the word.