Farmer Ben<br>Farmer Ben's chickens kept disappearing every week. He suspected that foxes were sneaking into his farm at night. Farmer Ben set some fox traps and waited. Sure enough, Farmer Ben caught a fox in one of his traps. Farmer Ben's chickens no longer went missing.
A fox was killing chickens.
Definitely correct, the chickens were killed by foxes.
( z1 kill :ARG0 ( z2 fox ) :ARG1 ( z3 chicken ) )