There is a person sitting on a plastic blow-up float in the high piled snow.
The person is snowboarding down a hill.
If the person is sitting in snow, they can't be snowboarding down a hill.
exists p1 s2 s3 x1 x6.(n_snow(x6) & a_piled(s3) & Theme(s3,x6) & a_high(s2) & Theme(s2,x6) & exists e1 s1 x2 x3 x4 x5.((x1 = x2) & in(e1,x6) & on(e1,x4) & n_float(x4) & a_blow-up(s1) & Theme(s1,x4) & of(x4,x5) & n_plastic(x5) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_person(x2)))
exists e1 s1 x1 x2.(n_person(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_snowboard(e1) & n_hill(x2))