A skateboarder in the air at a big, outdoor ramp.
the skateboarder does a trick for his friends
The trick doesn't have to be done for his friends.
exists s1 s2 s3 x1 x2 x3.(n_air(x2) & a_topic(x1) & in(x1,x2) & at(x2,x3) & n_ramp(x3) & a_outdoor(s3) & Theme(s3,x3) & a_,(s2) & Theme(s2,x3) & a_big(s1) & Theme(s1,x3) & n_skateboarder(x1))
exists e1 x1 x2 x3.(n_friend(x3) & of(x3,x1) & n_male(x1) & n_skateboarder(x1) & for(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2))