Editing Dual (grammatical number) (section)

==Arabic==
In [[Modern Standard Arabic]], as well as in [[Classical Arabic]], the use of dual is compulsory when describing two units. For this purpose, {{lang|ar|ان|rtl=yes}} {{transliteration|ar|DIN|-ān}} is added to the end of any noun or adjective regardless of gender or of how the plural is formed. In the case of feminine nouns ending with {{lang|ar|ة|rtl=yes}} {{transliteration|ar|DIN| ta marbuta}}, this letter becomes a {{lang|ar|ت|rtl=yes}} {{transliteration|ar|DIN|ta}}. When the dual noun or adjective is rendered in the genitive or accusative cases, the {{lang|ar|ان|rtl=yes}} {{transliteration|ar|DIN|-ān}} becomes {{lang|ar|ين|rtl=yes}} {{transliteration|ar|DIN|-ain}}.

Besides the noun and adjective dual, there are also dual verb forms of compulsory use for second and third person, together with their pronouns, but none for the first person.

The use of dual in [[Varieties of Arabic|spoken Arabic]] varies widely and is mostly rendered as {{lang|ar|ين|rtl=yes}} {{transliteration|ar|DIN|-ain}} even when in nominative context. Whereas its use is quite common in [[Levantine Arabic]], for instance {{lang|ar|كيلوين|rtl=yes}} {{transliteration|ar|DIN| kilowain}} meaning "two kilograms", dual forms are generally not used in [[Maghrebi Arabic]], where two units are commonly expressed with the word {{lang|ar|زوج|rtl=yes}} {{transliteration|ar|DIN| zuʒ}}, 
as in {{lang|ar| زوج كيلو |rtl=yes}} {{transliteration|ar|DIN| zuʒ kilu}} meaning "a pair of kilograms", with the noun appearing in singular.