some indo-european languages have had some kind of things like that. today all languages only have a singular and a plural, but ancient greek for example had in some cases remnants of the so called dual, signifying that the number is 2. i think the way more efficient form is just saying the number before the word, instead of having new endings for every case for every singular, plural, dual, trial etc
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Tok pisin (one of the official languages of Papua-New-Guinea) features something like that, somehow. In that language there are quite a variety of personal pronouns that specify very well if the person you're talking to is included in the verb action and there is singular, dual (for 2 people), a sort of "plural for 3", and then a "plural for 4 or more" people. Not quite the thing that you wanted. But close enough. Anyway: who needs that if you can just state the number of persons involved? (in your example: 2 girls, 3 girls, 489328 girls...)
I am not sure about that. Это is neuter gender, but only in Nominative and Acusative. Эта and Этой are both feminine gender, but for different cases. Here is what i found here http://www.russianlessons.net/grammar/pronouns.php
Here is table: masc. fem. neut. plur. Nominative Этот Эта Это Эти Accusative Этот Эту Это Эти Этого Этих Genitive Этого Этой Этого Этих Dative Этому Этой Этому Этим Instrumental Этим Этой Этим Этими Prepositional Этом Этой Этом Этих
My question is the same is first post. Why is это used for every gender?
Edit: And thanks for answer Pips_23
"Girls, it is my brother" is presented as a correct answer - to me it is clearly wrong unless the brother is an animal. Why "girls he is my brother" is wrong?