Sometimes the final hamzah is neither an original root letter nor a feminine marker. Under the rule taught here, that hamzah may either remain or change to waw.
سَمَاءٌ → سَمَاءَانِ
The hamzah remains.
سَمَاءٌ → سَمَاوَانِ
The hamzah changes to waw.
Both forms are valid here. This option must not be transferred to the previous two categories: original hamzah remains, while feminine hamzah changes to waw.
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Dual and Plural of Mamdud and Maqsur Nouns
Sometimes the final hamzah is neither an original root letter nor a feminine marker. Under the rule taught here, that hamzah may either remain or change to waw.
سَمَاءٌ → سَمَاءَانِ
The hamzah remains.
سَمَاءٌ → سَمَاوَانِ
The hamzah changes to waw.
Both forms are valid here. This option must not be transferred to the previous two categories: original hamzah remains, while feminine hamzah changes to waw.