A skateboarder attempts to do a trick over a homemade ramp.
A skateboarder is sitting in a chair, staring out a window.
One cannot attempt a skateboarding trick and be sitting in a chair simultaneously.
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_attempt(e1) & exists e2 x2 x3 x4.(over(e2,x3) & n_ramp(x3) & of(x3,x4) & n_homemade(x4) & Theme(e2,x2) & Actor(e2,x1) & v_do(e2) & n_trick(x2)) & n_skateboarder(x1))
exists e1 e2 s1 x1 x2 x3.(for(e1,e2) & a_out(s1) & Manner(e2,s1) & Theme(e2,x3) & Actor(e2,x1) & v_stare(e2) & n_window(x3) & in(e1,x2) & n_chair(x2) & Actor(e1,x1) & v_sit(e1) & n_skateboarder(x1))