The liturgical forms and prayers make up the third main division of the Book of Praise.

The forms for the administration of infant baptism and of the Lord's Supper as well as the form for the solemnization of marriage first appeared in the Dutch Psalter of Petrus Dathenus (1566). The forms for the administration of church discipline, the ordination of ministers, and the ordination of elders and deacons were added by the Synod of The Hague in 1586, and the form for the administration of adult baptism by the Synod of Dort in 1618-19. The Canadian Reformed Churches first used the version of these forms published in 1767 by the Reformed Protestant Dutch Church of New York. Later they were completely revised and published with forms adopted more recently.

The collection of prayers which follows the forms also dates from Reformation times; it, too, had its place in the Psalter of Dathenus. The English text of these prayers has now been modernized. Although their use is not obligatory, they can be of great value in public and private worship.