Someone is walking their dogs.
A guy fulfills his daily exercise with his dogs.
Not all someones are a guy and walking their dogs does not imply the walker fulfills his daily exercise.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_dog(x2) & of(x2,x1) & n_thing(x1) & n_person(x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_fulfil(e1) & with(x2,x3) & n_dog(x3) & of(x3,x1) & n_male(x1) & n_male(x1) & n_exercise(x2) & a_daily(s1) & Theme(s1,x2) & of(x2,x1) & n_guy(x1))