We, you, and they are (-(y)ız, -sınız)

Let's look at the plural subject pronouns: biz (we), siz (you plural/formal), and onlar (they).

We are (biz)

Attach -ız, -iz, -uz, or -üz using four-way vowel harmony. If the word ends in a vowel, add a buffer y first (-yız, -yiz, etc.). One more sound rule: a final ç softens to c before these vowel suffixes — genç becomes genciz ("we are young").

You are (siz)

To address a group—or to be formal to a single person—use -sınız, -siniz, -sunuz, or -sünüz.

They are (onlar)

For "they are," attach the two-way vowel harmony suffixes -lar or -ler.

Dropping Pronouns

Because the suffix already shows the subject, the pronouns themselves are completely optional.