Children in what appears to be an elementary school classroom hard at work.
Children are playing at recess.
The children would not be hard at work in the classroom if they are playing at recess.
exists x1.(exists e1 p1 x2.(n_thing(x2) & a_topic(x1) & in(x1,x2) & Topic(e1,p1) & Actor(e1,x2) & v_appear(e1) & exists p2 s1 x3.(at(p2,x3) & n_work(x3) & a_hard(s1) & Manner(p2,s1) & exists s2 x4 x5.((x2 = x4) & n_classroom(x4) & of(x4,x5) & n_school(x5) & a_elementary(s2) & Theme(s2,x4)))) & n_child(x1))
exists e1 x1 x2.(at(e1,x2) & n_recess(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))