A boy with glasses on is sitting in a chair at the dentist.
A boy is playing with some other childrens
The playing child contradicts with the child sitting in a chair in sentence 1.
exists e1 s1 x1 x2 x3 x4 x5.(n_dentist(x5) & at(e1,x5) & in(e1,x4) & n_chair(x4) & Actor(e1,x1) & v_sit(e1) & with(x1,x2) & Theme(s1,x3) & a_on(s1) & (x2 = x3) & n_glass(x2) & n_boy(x1))
exists e1 x1 x2 x3.(n_children(x3) & with(e1,x2) & -(x2 = x3) & n_children(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))