Rattler<br>Will was taking a stroll in his favorite park. Will noticed a sound as he went around a bend in the path. He looked down to see a rattlesnake! Will very slowly and cautiously walked backwards away from the snake. Will reached his car with a huge sigh of relief.
Will cannot walk backwards.
( z1 possible :polarity - :ARG1 ( z2 walk :ARG0 ( z3 i ) :direction ( z4 backwards ) ) )