In the extraordinary form, there are three octaves (there used to be many more, but most of these were trimmed back in the mid twentieth century): the Octaves of Easter, Pentecost, and Christmas. The Octaves of Easter and Pentecost were the oldest and are first class octaves in the 1962 liturgy [the octave of Christmas is a second class octave]. This post contains the traditional propers for Pentecost Monday.
Ant. He fed them with the fat of wheat, alleluia; and filled them with honey out of the rock, alleluia, alleluia.
V. Rejoice to God our helper; sing aloud to the God of Jacob.
V. Glory be...
V. Come, Holy Spirit, send forth the heavenly radiance of Your light.
V. Come, Father of the poor. Come, Giver of gifts. Come, Light of the heart.
V. Greatest Comforter, sweet Guest of the soul, Sweet consolation!
V. O Rest in labor, O Temperance in heat, O Solace in tears,
V. O most blessed Light, fill the inmost heart of Your faithful.
V. Without Your spirit, there is nothing in man, nothing that is not harmful.
V. Cleanse that which is unclean; water that which is dry; heal that which is wounded.
V. Bend that which is rigid; inflame that which is frigid; rule that which has deviated.
V. Grant to Your faithful who trust in You, the sevenfold gifts.
V. Grant the merit of virtue; grant the deliverance of salvation; grant eternal joy. Amen. Alleluia.
Ant. The Lord thundered from heaven, and the Most High gave His voice; and the fountains of water appeared, alleluia.
Ant. The Holy Spirit shall teach you, alleluia; whatever I shall have said to you, alleluia, alleluia.