The biker carries his bike over the obstacle.
The biker is riding on the frozen lake.
The biker cannot hold his bike and ride it at the same time.
exists e1 x1 x2 x3.(n_obstacle(x3) & n_bike(x2) & of(x2,x1) & n_male(x1) & n_biker(x1) & Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & over(x2,x3))
exists e1 s1 x1 x2.(n_lake(x2) & a_frozen(s1) & Theme(s1,x2) & n_biker(x1) & on(e1,x2) & Actor(e1,x1) & v_ride(e1))