What you guys think about discussion introductions?

What is the predicate noun in the following sentence? my favorite flower is the rose.

The purpose of antitrust law is to support efforts of companies to take over others discourage competition in certain markets force similar companies to combine into one protect competition by preventing monopolies

Which sentence uses the denotative meaning of the word blue? i was feeling pretty blue when i lost my favorite earrings. i wore a blue scarf to complement the color of my eyes. the characters in the book all seemed rather blue. the movie’s ending always puts me in a blue mood.