The skateboarder jumps over the ramp.
rollerbladers burn down local animal shelter
The first sentence refers to one skateboarder but the second sentence refers to multiple rollerblades.
exists e1 x1 x2.(n_ramp(x2) & n_skateboarder(x1) & over(e1,x2) & Actor(e1,x1) & v_jump(e1))
exists e1 s1 s2 x1 x2 x3.(a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_burn(e1) & n_shelter(x2) & of(x2,x3) & n_animal(x3) & a_local(s1) & Theme(s1,x2) & n_rollerblader(x1))