The Contrastive Structure is a great grammatical format for when you are comparing and contrasting two things or discussing two topics (you do not need to actually compare and contrast). By using this structure, you are making your message easier to produce and understand. This structure requires the use of referents.

A reminder, once a referent is established (set up) it stays there until the end of the conversation, change of topic, or until you establish (set up) something new. To establish a new topic, person, etc. repeat the same steps used to originally set up something. You do not need to state that you are ending, removing, or replacing a referent.