sis

sis is a Latin form of sum, meaning “be, exist; (as auxiliary) is, are, was”. It is the 2nd person singular present active subjunctive.

Found 846 times in the Latin texts on Socratos.

Where it is used

Cicero, Pro S. Roscio Amerino 48: age nunc, refer animum sis ad veritatem et considera non modo in Umbria atque in ea vicinitate sed in his veteribus municipiis quae stud …

Vergil, Eclogues 5.65: Sis bonus O felixque tuis! En quattuor aras:

Plautus, Asinaria 1.1.43: Cave sís malam rem.

All forms of sum (conjugation table)

Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.