It is referred to as the Roman Missal or the sacramentary.
During the liturgy of the word you need to be listening to the priest/bishop or deacon because during this part of the mass we learn of redemption and salvation through the proclamation of the scriptures.
During the Liturgy of the Eucharist you need to response "Amen" after the priest finish the Eucharist Prayer
The priest consencrates the bread and wine.
Deacons and alter servers help the priest during the liturgy.
There are many prayers prayed by the priest during the Eucharist. I'm thinking that you are asking about a specific one, but this is just a guess. The Canon or Eucharistic Prayer is the central portion of the Eucharistic liturgy, it has eight parts: Preface, Acclamation, Epiclesis, Consecration, Anamnesis, Oblation, Intercessions, and Doxology.
A deacon at mass is a clergy member who assists the priest during the liturgy, such as proclaiming the Gospel, leading prayers, and assisting with the distribution of Holy Communion. Deacons may also be involved in other ministries within the church, such as serving the poor and marginalized in the community.
A Lavabo Bowl.
These are led by the priest in Church. Lay people do not lead prayers in Church. In some instances, such as during Vigil services, the priest will start the prayers, and then lay people continue to read them. But where a priest is present with lay people, only he can lead the prayers.
The lector reads from a book called the Lectionary which the priest also reads the gospel from. The book of prayers the priest reads from at the altar and chair is called the Roman Missal, or Sacramentary.
The Priest says, "The Lord be with you" during the Introduction rite and the Concluding rite.
Roman Catholic AnswerWhen the priest actually gives you Holy Communion, he says, "The Body of Christ".
Catholic AnswerThe Liturgy of the Word constitutes the first part of the Mass. The introduction by the priest (or Bishop), the penitential rite, Gloria (if called for) and the opening prayer; then two readings with a psalm between them (on Sundays and Solemnities) followed the Alleluia acclamation and the Gospel. Then the priest may give a homily, followed by the Nicene Creed, and the Prayers of the People.