If:
then:
Example:
| وُجُوْهٌ | → | أُجُوْهٌ |
| وِشَاحٌ | → | إِشَاحٌ |
| وُقَّتَتْ | → | أُقَّتَتْ |
| أَدْوُرٌ | → | أَدْءُرٌ |
Note: it is rare to change a و with a fatḥah to a ء.
Example:
| وَحَدٌ | → | أَحَدٌ |
| وَناةٌ | → | أَناةٌ |
When a word begins with two wāws, the first is replaced by hamzah.
When two wāws meet at the end of the scale فُعُوْلٌ, both become a yāʾ with shaddah and the preceding ḍammah turns to a kasrah.
When wāw and yāʾ combine in one word under set conditions, the wāw becomes yāʾ and the two merge with tashdīd.
Rule for forming the maṣdar ʿidah from وَعْدٌ: drop the initial wāw, give the ʿayn al-kalimah a kasrah, and append tāʾ marbūṭah.
