A girl squats on a rock while another stands by her.
girls wait for mom
Just because the girl squats next to another means they wait for mom.
exists e1 x1 x2 x3 x4.(n_female(x3) & n_stand(x3) & by(e1,x3) & while(e1,x4) & n_stand(x4) & -(x4 = x3) & on(e1,x2) & n_rock(x2) & Actor(e1,x1) & v_squat(e1) & n_girl(x1))
exists e1 x1 x2.(for(e1,x2) & n_mom(x2) & Actor(e1,x1) & v_wait(e1) & n_girl(x1))