A little boy quickly pushes another child on a riding toy.
The little boy is alone
Alone means no one with, while it was mentioned that the little boy pushes another child.
exists e1 s1 s2 x1 x2 x3 x4 x5.(n_child(x2) & a_quickly(s2) & Manner(e1,s2) & on(e1,x4) & n_toy(x4) & of(x4,x5) & n_riding(x5) & Theme(e1,x3) & Actor(e1,x1) & v_push(e1) & n_child(x3) & -(x3 = x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists s1 s2 x1.(n_boy(x1) & a_little(s1) & Theme(s1,x1) & Theme(s2,x1) & a_alone(s2))