If:
Then:
Example:
| دُعَاوٌ | → | دُعَاءٌ |
| رُوَايٌ | → | رُوَاءٌ |
| دِعَاوٌ | → | دِعَاءٌ |
| أَسْمَاوٌ | → | أَسْمَاءٌ |
| أَحْيَايٌ | → | أَحْيَاءٌ |
| كِسَاوٌ | → | كِسَاءٌ |
| رِدَايٌ | → | رِدَاءٌ |
When a wāw stands as the lām kalimah after a kasrah, it converts to a yāʾ, yielding forms like duʿiya and dāʿiyah.
Morphological rule: a ي in the lām position after a ḍammah converts to a و.
When wāw falls on the fourth letter or later and is not preceded by a ḍammah or wāw sākin, it is converted to yāʾ.
When a wāw or yāʾ falls in the ʿayn position of an active participle whose verb is muʿtal, it converts to hamzah.
