-sın

Suffix

 * 1) Suffix of verb "to be" for subject "you" (informal).

Usage notes

 * It's used when the word's last vowel is one of "a" or "ı".
 * It could be "-sun", "-sün", "-sin" according to the last vowel of the word.
 * While talking about you (plural) and you (formal), it becomes "-sınız"