An elderly man wearing a hat and jacket is bicycling down a brick paved path while sunlight streams through autumn trees ahead.
The old man is walking.
To be bicycling is not to be walking, because you cannot do both at the same time.
exists e1 e2 p1 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7.(exists e3 x8 x9 x10.(through(e3,x9) & r_ahead(x9) & n_tree(x9) & of(x9,x10) & n_autumn(x10) & Actor(e3,x8) & v_stream(e3) & n_sunlight(x8)) & while(e2,p1) & a_down(s3) & Manner(e2,s3) & Theme(e2,x6) & Actor(e2,x1) & v_bicycle(e2) & n_path(x6) & a_paved(s2) & Theme(s2,x6) & of(x6,x7) & n_brick(x7) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_jacket(x5) & n_hat(x4) & subset_of(x5,x3) & subset_of(x4,x3) & (x1 = x2) & n_man(x1) & a_elderly(s1) & Theme(s1,x1))
exists e1 s1 x1.(n_man(x1) & a_old(s1) & Theme(s1,x1) & Actor(e1,x1) & v_walk(e1))