A man wearing a backpack and helmet riding a bicycle.
The bicycle is standing up straight.
There is a bicycle in both sentences
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_ride(e2) & n_bicycle(x4) & n_helmet(x3) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_backpack(x2) & n_man(x1))
exists e1 s1 s2 x1.(n_bicycle(x1) & a_straight(s2) & Manner(e1,s2) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1))