Vespers as served on the weekdays and Sundays evenings of Great Lent (or during other fasting seasons of the year) takes one of three forms:
Vespers with the Liturgy of the Presanctified
Vespers on Weekdays without the Liturgy of the Presanctified
(Served on any weekday when the Presanctified is not celebrated—typically Monday, Tuesday, and Thursday)
Vespers on Sunday evenings