The pencap<br>I needed a to write a song. I had nothing to write with. I looked in my desk for a pen. I only saw a pen cap. I threw the pen cap away.
The author was unable to find a writing utensil. 
( z1 possible :polarity - :ARG1 ( z2 find :ARG0 ( z3 person :ARG0-of ( z4 author ) ) :ARG1 ( z5 utensil :instrument-of ( z6 write ) ) ) )