Small child is rollerskating while bicyclists ride around a track.
A kid rollerskates while his parents ride bikes and watch.
A child roller skating does not imply parent ride bikes and watch.
exists e1 p1 s1 x1.(exists e2 x2 x3.(around(e2,x3) & n_track(x3) & Actor(e2,x2) & v_ride(e2) & n_bicyclist(x2)) & while(e1,p1) & Actor(e1,x1) & v_rollerskate(e1) & n_child(x1) & a_small(s1) & Theme(s1,x1))
exists e1 p1 x1 x2.(exists e2 x3 x4 x5.(Theme(e2,x3) & Actor(e2,x2) & v_ride(e2) & subset_of(x5,x3) & n_watch(x5) & subset_of(x4,x3) & n_bike(x4)) & n_parent(x2) & of(x2,x1) & n_male(x1) & while(e1,p1) & Actor(e1,x1) & v_rollerskate(e1) & n_kid(x1))