|Sakin Waw |
When a letter has the diacritical mark Sukun over it, it is pronounced with no following vowel. For example,
[ مِن ] with Sukun over Nun [ ن ] is pronounced "min", while [ مِنَ ] with Fathah over Nun [ ن ] is pronounced "mina".
If the letter before the Waw [ و ] has a Fathah and the Waw [ و ] has a Sukun, the vowel is pronounced like two vowels together as in the English word "cow".
However, [ و ] preceded by a letter with Dammah is lengthened as in تُوبَ [tuba]. In this case, [ و ] is written without Sukun.
Now read the examples and pay special attention to the diacritical marks over Waw [ و ] and the letter preceding it.