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In surah Al Kahf in ayah 77 it sounds like an extra sound is added between the following words:  Is there an extra sound? 


This is a very important question, and may Allah reward you for asking it. 

In Arabic there is a rule forbidding the meeting of two saakin letters between two words.  If there is a sukoon on the last letter of a word, and the first letter of the next following word has a sukoon, one of two things happen:

  1. If the last letter of the first word is a medd letter (alif, ya’ saakinah preceded by a kasrah, or a wow saakinah preceded by a dhammah), the medd letter is dropped in pronunciation. 
  2. If the last letter is not a medd letter, it acquires a vowel.  The vowel that is acquired is usually, but not always a kasrah.  The noon of the word  acquires a fat-h when followed by a sukoon.  The meem of the plural pronoun acquires a dhammah.


In the example you asked about , there is a tanween at the end of the word , and we know from the tidbit lessons the tanween is a vowel plus a  saakinah; thus this word ends with a sukoon.  The next word,  has a  saakinah as the first letter, since the hamzah wasl ( ) is ignored when continuing. When reading these two words together without stopping, we know now that there are two saakin letters next to each other, the tanween of the word  and the  of the word .  The tanween then acquires a kasrah, to rid us of the problem of having two saakin letters next to each other.  This is the extra sound you are hearing.  Instead of the  of the tanween being saakinah, it now has a kasrah.  In pronunciation now, this word is pronounced (but not written) as: , then the reader goes directly to the  saakinah of the word .  Again, this is only when reading in continuum, which will be the usual case with these two words.  The same holds for all word ending in a tanween and followed by a word that has a sukoon as the first pronounced letter; in all cases the tanween will get a kasrah to prevent the two saakin letters from meeting.