lemon,

I don´t get you. Can you be more specific?

For example why did you cross AT "siz"?

Sender (Siz) = You (plural)

"Sizder" (sizler) is understood but do you say "sender" (plural of "sen") is not OK?

yes.

sen -> sender

siz -> sizder

and sometimes we say

biz -> bizder

We also sometimes say

biz -> bizler

siz -> sizler

And why didnt you understand then? What was the problem? that you dont have sen and sender?

We don´t use sender (senler).

You use Siz instead of sender/senler?

Yes

Ablative Case:

-dan, -den (after voiced consonants or wovels)

-tan, -ten (after voiceless consonants)

-nan,-nen (after -m, -n, -ñ and after possessive suffixes excluding 1st and 2nd pl. persons)

tilden (dilden) = from the language/tongue

ağaştan (ağaçtan) = from the tree

kimnen (kimden) = from who

tiliñnen (dilinden) = from your language/tongue

ağaşımnan (ağacımdan) = from my tree

atınan (onun atından) =  from his/her horse

Instrumental Case:

-men(en) (after wovels)

-ben(en) (after voiced consonants)

-pen(en) (after voiceless consonants)

bala-men (çocuk-la) = with the child

qız-ben (kız-la) = with the girl

at-pen(en) (at-la) = with the horse

Equative case: (See wikipedia for an explaination)

-day/-dey (after voiced consonants or vowels)

-tay/-tey (after voicless consonants)

arıstan-day (aslan gibi) = like a lion

böri-dey (kurt gibi) = like a wolf

at-tay (at gibi) = like a horse

Kıpçak grubundan bir lehçe öğreneceğim, sanırım bu Kazakça olmalı. Derslere devam si++, teşekkürler. Limon Kazak Türk´ü müsün?