Since the phrase <em>on the couch </em>shows us the place where the jacket can be found, it has some adverbial meaning. So this is used as an adverb.
Those are the force of friendship bonds.... I think.
Explanation:
Thank you for your letter. I am glad that you're keeping well <em>to </em><em>hear.</em>
Answer:
for tragedy play its black globe theatre flags... for history plays red globe theatre flags
for comedy play its white globe theatre flags...
hope it helps!