Little boy wanting to play outside of fence.
A girl plays happily in her room.
The subject can not be both a boy and a girl at the same time. The boy wanting to play outside of the fence infers that he is already outside, which means he could not be happily playing in a room.
exists e1 p1 s1 x1 x2.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_want(e1) & exists e2 x3.(of(e2,x3) & n_fence(x3) & r_outside(e2) & Actor(e2,x2) & v_play(e2)) & (x1 = x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(in(e1,x2) & n_room(x2) & of(x2,x1) & n_female(x1) & a_happily(s1) & Manner(e1,s1) & Actor(e1,x1) & v_play(e1) & n_girl(x1))