A woman sings to a crowd of people.
A woman is singing.
"Woman is singing" is a rephrasing of "woman sings."
exists e1 x1 x2 x3.(to(e1,x2) & of(x2,x3) & n_people(x3) & n_crowd(x2) & Actor(e1,x1) & v_sing(e1) & n_woman(x1))
exists e1 x1.(Actor(e1,x1) & v_sing(e1) & n_woman(x1))