-siniz

== Azerbaijani == === Etymology === From Proto-Turkic *siŕ, but affected by *-iŋiŕ (“second person possessive suffix”). Cognate with Turkish -siniz, Turkmen -siz. === Pronunciation === IPA(key): [siˈniz] === Suffix === -siniz Second-person plural present simple copula (used suppletively in place of *imək): [you (plural or polite)] are == Turkish == === Suffix === -siniz Suffix of verb "to be" for subject "you" (formal or plural). Gerginsiniz. ― You are nervous. ==== Usage notes ==== It's used when the word's last vowel is one of "e" or "i". It could be "-sunuz", "-sünüz", "-sınız" according to the last vowel of the word. While talking about you (singular) or you (informal), it becomes "-sin"