Stir yeast into 5 cups of flour in a large bowl. Add margarine to warm water & stir until melted. Add milk, salt & sugar. Pour into flour & yeast & beat. Let stand 15 minutes. Beat. Add remaining flour to make a soft dough. (Usually use not quite 12 cups). Knead until smooth & elastic. Grease ball and place in bowl. Cover. Let rise to double. Knead down and divide into 4 balls. Let stand 15 - 30 minutes. Grease loaf pans with lard. Form into loaves & roll into pan to grease loaf. Let rise until 3/4 " over top of pan. Bake at 350? for 25 minutes.