A teacher in a purple hat talks to five school children.
A teacher is talking to her school children.
The teacher must be talking to school children and it can be inferred that they are her students.  She is talking to school children in both sentences.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & to(x2,x4) & n_child(x4) & of(x4,x5) & n_school(x5) & card_eq_5(x4) & n_talk(x2) & of(x2,x3) & n_hat(x3) & a_purple(s1) & Theme(s1,x2) & n_teacher(x1))
exists e1 x1 x2 x3.(to(e1,x2) & n_child(x2) & of(x2,x3) & n_school(x3) & of(x2,x1) & n_female(x1) & Actor(e1,x1) & v_talk(e1) & n_teacher(x1))