Children stand and wait for the train.
Some children are sleeping at a bus stop.
You would not be waiting for a train at a bus stop because trains only stop at train stations.
exists e1 s1 x1 x2 x3 x4.(n_train(x4) & a_topic(s1) & subset_of(x3,s1) & for(x3,x4) & n_wait(x3) & subset_of(x1,s1) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_child(x1))
exists e1 x1 x2 x3.(at(e1,x2) & n_stop(x2) & of(x2,x3) & n_bus(x3) & Actor(e1,x1) & v_sleep(e1) & n_child(x1))