Describe the four marks of the church and describe how do they function in the church? If you are not Catholic find out how your Church defines the Church and describe the nature of the sacraments? Most of the churches have catechisms of sorts which describe their primary teachings.
Look up Ecclesis de Eucharistia and describe why that Eucharist is the source and summit of the life of the church. What does the Eucharist do for the Church? describe why is it essential to the Catholic understanding of the Church? What are the four marks of the Church and describe why are they understood in the light of the Eucharist?