-sünüz

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 "ö" or "ü".
 * It could be "-sunuz", "-siniz", "-sınız" according to the last vowel of the word.
 * While talking about you (singular) or you (informal), it becomes "-sün"