Here, this will help you...
“However that may be, the Holy See has been concerned about the laity unduly aping the priest at Mass, and in the 1997 Instruction on Collaboration, an unprecedented conjunction of Vatican dicasteries wrote:
6 § 2. To promote the proper identity (of various roles) in this area, those abuses which are contrary to the provisions of canon 907 [i.e., “In the celebration of the Eucharist, deacons and lay persons are not permitted to say the prayers, especially the eucharistic prayer, nor to perform the actions which are proper to the celebrating priest.”] are to be eradicated. In eucharistic celebrations deacons and non-ordained members of the faithful may not pronounce prayers — e.g. especially the eucharistic prayer, with its concluding doxology — or any other parts of the liturgy reserved to the celebrant priest. Neither may deacons or non-ordained members of the faithful use gestures or actions which are proper to the same priest celebrant. It is a grave abuse for any member of the non-ordained faithful to “quasi preside” at the Mass while leaving only that minimal participation to the priest which is necessary to secure validity.
This instruction, incidentally, was approved by John Paul II in forma specifica, meaning that the pope invested it with his own authority and is binding on us with the pope’s authority and not merely the authority of the authoring congregations.”
From here
http://www.jimmyakin.org/2005/06/ed_peters_has_a.html
In other words, pray in silence along with the priest than?