A man in a helmet is riding a bike.
A man in a helmet exercising.
a man in a helmet exercising by riding a bike .
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_bike(x3) & in(x1,x2) & n_helmet(x2) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_exercise(x2) & of(x2,x3) & n_helmet(x3) & n_man(x1))