Well, Kathleen, dear friend of mine, I think vocabulary is probably harder to learn for most people... however, sometimes pronunciation is very difficult to learn (and to teach) also. For instance, people who struggle with the "r" sound typically have a very hard time conquering that problem... Dylan, my brother, couldn't pronounce his "r's" till he was 11. As a side note, I guess as a teacher, it all boils down to personal opinion. For instance, I would be very impressed with a student whose vocabulary included the word, "rendezvous"... I would be even more impressed if he actually pronounced it correctly. :)

Correction 1: (If you are trying to be artistic or poetic) The rusting of the morning stars. What is it worth? The shine of the moon in your eyes or in your soul?

 

Correction 2: (If you are going for sentence completeness) Is the rusting of the morning stars worth the shine of the moon in your eyes and in your soul?