“Two“ in standard Arabic can be ITHNAAN, or ITHNAYN: ITHNAAN if it’s in the nominative case, ITHNAYN if it’s in the accusative or genitive/prepositional cases.
When a noun is isolated in Arabic, it is in the nominative case, so that would be ITHNAAN.
That being said, when Arabs speak, about 90 percent of them use ITHNAYN regardless of grammatical context, even though it is grammatically incorrect half the time.
All of the above is in the masculine. The equivalent feminine forms are ITHNATAAN and ITHNATAYN, respectively.
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