The Mower<br>Josh was mowing his yard. It had just rained recently. The ground was still a little soft. The lawnmower started to slow down. Josh realized the mower was stuck in the mud.
Josh got stuck in the mud.
The statement belongs to the definitely correct category because Josh was stuck in the mud, though it was through the lawnmower which may be the reason the AI had difficulty. 
( z1 stick :ARG1 ( z2 person :name ( z3 name :op "Josh" ) ) :ARG2 ( z4 mud ) )