In a large bowl, dissolve yeast in warm water. Add sugar, salt, eggs, oil and 3 cups flour; beat on medium speed until smooth. Stir in enough remaining flour to form a soft dough.
Turn dough onto a floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a greased bowl, turning once to grease the top. Cover and let rise in a warm place until doubled, about 1 hour.
Punch down dough. Divide in half and shape into loaves. Place in two greased 9×5-in. loaf pans. Cover with kitchen towels; let rise in a warm place until doubled, about 1 hour. Preheat oven to 375°.
Bake until golden brown, 25-30 minutes. Remove from pans to wire racks to cool.