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Questions & Answers about Biz sokakta değiliz.
Why does sokakta end in -ta instead of the usual "in/on" suffix -da?
This is because of consonant assimilation! The word sokak (street) ends in the hard consonant k. When you add a suffix that starts with d (like the locative suffix -da), the hard k forces the d to change to a hard t to make pronunciation smoother. So, sokak + -da becomes sokakta.
Why is the personal ending attached to değil and not to sokakta?
In Turkish, when you make a "to be" sentence negative using değil (not), the personal suffix (like -iz for "we") always attaches to değil. If this were a positive sentence ("We are on the street"), the suffix would attach to the location: Biz sokaktayız. But in the negative, the location stays plain and değil takes the personal ending.
Why is the ending on değiliz exactly -iz?
The "to be" suffix for "we" changes its vowel to match the word it attaches to (-ız, -iz, -uz, or -üz). Because the last vowel in the word değil is an i, vowel harmony rules dictate that the suffix must be the matching -iz form.