A boy in a green sweater is sitting at a table.
A boy is preparing for bed.
The boy cannot be preparing for bed and sitting at a table
exists e1 s1 x1 x2 x3.(at(e1,x3) & n_table(x3) & Actor(e1,x1) & v_sit(e1) & in(x1,x2) & n_sweater(x2) & a_green(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2.(for(e1,x2) & n_bed(x2) & Actor(e1,x1) & v_prepare(e1) & n_boy(x1))