If:
then:
Example:
| اِوْتَقَدَ | → | اِتَّقَدَ |
| اِيْتَسَرَ | → | اِتَّسَرَ |
When a maṣdar of the pattern faʿlūlah has a wāw as its ʿayn kalimah, the wāw is changed to a yāʾ.
When a wāw stands as the lām kalimah after a kasrah, it converts to a yāʾ, yielding forms like duʿiya and dāʿiyah.
When a wāw or yāʾ falls in the ʿayn position of an active participle whose verb is muʿtal, it converts to hamzah.
On the scale of fuʿlā with a wāw lām, the wāw turns to yāʾ; on faʿlā with a yāʾ lām, the yāʾ turns to wāw.
