Backyard Camping<br>John and his friends were camping in his backyard. Late that night, the boys heard a growling noise. A large shadow appeared on the tent door. The tent flap flew open and the boys screamed. John's father laughed hysterically at their reaction.
John's camping friends were all male.
John and his friends are repeatedly called "boys" in the exerpt; had there been a girl, it would have been worded differently, but the system didn't catch that.
( z1 male :domain ( z2 person :ARG0-of ( z3 have-rel-role :ARG1 ( z4 person :name ( z5 name :op "John" ) ) :ARG2 ( z6 friend :ARG0-of ( z7 camp ) ) ) :mod ( z8 all ) ) )