You must respond by serving the landlord with this Tenant's Reply to Notice of Rent Increase and Modification of Another Condition of the Lease, in accordance with article 1955 of the Civil Code of Quebec. The Notice informs your landlord that you have decided either to renew the lease with the modifications, or to not renew the lease and vacate the premises, or to refuse the modifications and renew the lease as is.
This Quebec Tenant's Reply to Notice of Rent Increase form is an English-language form provided by the Régie du logement.