A child seated at the dentists.
A child is seated at his first dentist appointment.
The child could have gone to the dentist before, and it wouldn't be their first time.
exists e1 x1 x2.(n_dentist(x2) & at(e1,x2) & Theme(e1,x1) & v_seat(e1) & n_child(x1))
exists e1 s1 x1 x2 x3.(at(e1,x2) & n_appointment(x2) & of(x2,x3) & n_dentist(x3) & a_first(s1) & Theme(s1,x2) & of(x2,x1) & n_male(x1) & Theme(e1,x1) & v_seat(e1) & n_child(x1))