A girl blows a whistle.
The girl is blowing a whistle
Blows is the same as is blowing.
all x1.(n_whistle(x1) -> exists x2 x3.(a_topic(x2) & for(x2,x1) & n_blow(x2) & of(x2,x3) & n_girl(x3)))
exists e1 x1 x2.(n_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_blow(e1) & n_whistle(x2))