An ice cream truck is driving down the street.
An ice cream truck is driving quickly down the street.
Just because  An ice cream truck is driving down the street does not mean that truck is driving quickly down the street.
exists e1 s1 x1 x2 x3 x4.(n_street(x4) & a_down(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x1) & v_drive(e1) & n_truck(x1) & of(x1,x3) & n_cream(x3) & of(x1,x2) & n_ice(x2))
exists e1 s1 x1 x2 x3 x4.(n_street(x4) & down(e1,x4) & a_quickly(s1) & Manner(e1,s1) & Actor(e1,x1) & v_drive(e1) & n_truck(x1) & of(x1,x3) & n_cream(x3) & of(x1,x2) & n_ice(x2))