A person is repairing a bicycle while four people watch in an urban setting.
bike fell off car
The bike could need repairs for any reason, nothing in the first sentence implies that the bike fell off car.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6.(in(e2,x6) & n_setting(x6) & a_urban(s1) & Theme(s1,x6) & Theme(e2,x5) & Actor(e2,x1) & v_watch(e2) & n_thing(x5) & while(e1,x4) & n_people(x4) & card_eq_4(x4) & Theme(e1,x3) & Actor(e1,x2) & v_repair(e1) & n_bicycle(x3) & (x1 = x2) & n_person(x1))
exists e1 s1 x1 x2.(a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_fall(e1) & n_car(x2) & n_bike(x1))