A male teacher is instructing his class of young children.
A person is alone.
The subject cannot be instructing a class and be alone.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_instruct(e1) & of(x2,x3) & n_child(x3) & a_young(s2) & Theme(s2,x3) & n_class(x2) & of(x2,x1) & n_male(x1) & n_teacher(x1) & a_male(s1) & Theme(s1,x1))
exists s1 x1.(Theme(s1,x1) & a_alone(s1) & n_person(x1))