-sınız

Suffix

 * 1) Suffix of verb "to be" for subject "you" (formal or plural).

Usage notes

 * It's used when the word's last vowel is one of "a" or "ı".
 * It could be "-sunuz", "-siniz", "-sünüz" according to the last vowel of the word.
 * While talking about you (singular) or you (informal), it becomes "-sın"