A man wearing a red helmet rides a bike.
There is a person on a bicycle.
A person is a man and rides a bike is a different way of saying on a bicycle.
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_ride(e2) & n_bike(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_helmet(x3) & a_red(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_bicycle(x3) & n_person(x2))