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.
They could have written a song if they had found a pen.
( z1 possible :ARG1 ( z2 write :ARG0 ( z3 they ) :ARG1 ( z4 song ) ) :condition ( z5 find :ARG0 z3 :ARG1 ( z6 pen ) ) )