A man in black pants is wearing a yellow hard hat as he rides a zipline.
This is the first time the man has rode a zipline.
The man may or may not have ridden a zip line before, so it may not be his first time.
exists e1 p1 s1 s2 s3 x1 x2 x3.(exists e2 x4.(Theme(e2,x4) & Actor(e2,x1) & v_ride(e2) & n_zipline(x4)) & n_male(x1) & as(e1,p1) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_hat(x3) & a_hard(s3) & Theme(s3,x3) & a_yellow(s2) & Theme(s2,x3) & in(x1,x2) & n_pants(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists p1 s1 x1 x2 x3.(n_man(x3) & n_time(x2) & a_first(s1) & Theme(s1,x2) & n_thing(x1) & exists p2.((x1 = x2) & exists e1 x4.(Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_zipline(x4)) & that(x2,p2)))