a list
The daily exercise routine should include at least the following: ten minutes of stretching, forty abdominal crunches, and a twenty-minute run.
an appositive
My roommate seems to live on two things: Twizzlers and Twitter.
a quotation
Consider the words of Benjamin Franklin: “There never was a good war or a bad peace.”
a summary or an explanation
Faith is like love: It cannot be forced.
The novel is clearly autobiographical: The author even gives his own name to the main character.