A man and a young child.
A man sits alone.
A man cannot sit alone if there is a young child present as well.
exists s1 s2 x1 x2.(a_topic(s1) & subset_of(x2,s1) & n_child(x2) & a_young(s2) & Theme(s2,x2) & subset_of(x1,s1) & n_man(x1))
exists e1 s1 x1.(a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_man(x1))