sois

/swa/être
1.
verbSubjunctive3rdPresSing1, 2

be (present subjunctive — first and second person singular)

Il faut que tu sois là à l'heure.

You need to be there on time.

2.
verbImperative3rdPresSing2

be (imperative — second-person singular; used to give commands or advice)

Sois poli avec les invités.

Be polite with the guests.