Comments by "Angry Kittens" (@AngryKittens) on "Features English is missing - but most other languages have" video.
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Clusivity isn't something unique to the Pacific. It is found in virtually ALL Austronesian languages. The dual and plural form of the pronoun also evolved from the merging of the word for "us/we" + the numerals "two" and "three"; although the latter meaning has evolved to just a generic plural and doesn't necessarily mean there are three people. Compare:
Cebuano (Philippines): kita duha (us two + you), kita tulo (us three + you), kami duha (us two - you), kami tulo (us three - you)
Tausug (Philippines): kita duwa (us two + you), kita tū (us three + you), kami duwa (us two - you), kami tū (us three - you)
Tongan (Melanesia): kitaua (us two + you), kitautolu (us + you), kimaua (us two - you), kimautolu (us - you)
Samoan (Polynesia): tā‘ua (us two + you), tātou (us + you), mā‘ua (us two - you), mātou (us - you)
Tahitian/Māori (Polynesia): tāua (us two + you), tātou (us + you), māua (us two - you), mātou (us - you)
Hawaiian (Polynesia): kāua (us two + you), kākou (us + you), māua (us two - you), mākou (us - you)
And yes, also:
Cebuano (Philippines): kita duha (us two + you), kita tulo (us three + you), kami duha (us two - you), kami tulo (us three - you), kita upat (us four + you), kami upat (us four - you)
Lihir (Melanesia): kito (us two + you), kitol (us three + you), gel (us two - you), getol (us three - you), kitahet (us four + you), gehet (us four - you)
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