You're giving your girlfriend a shoulder massage. The muscles in her shoulders feel hard; you think it's because she's stressed out. You say:
Your shoulders are so tense!
body, possessive, stress 
You're on a job interview, and the interviewer offers you the job! However, he wants you to start immediately. You don't think that's possible because you haven't quit your job yet. You say:
I feel obligated to give at least three weeks' notice at my current job.
infinitive, job, modal, possessive 
You're watching a sports news show. The announcers are talking about a basketball team which has not been very good for the past few years. One announcer says:
This is the Cougars' fifth straight losing season.
possessive, seasons, sports You added a new Facebook friend and the two of you have been posting a lot of messages to each other. Your wife asks who he is. He's someone who you knew in elementary school. You say:
He's an old childhood friend of mine.
Facebook, friend, past, possessive 