lady seems upset about something.
The man is riding a horse.
a lady can't be inferred as man.
exists e1 p1 x1.(exists s1 x2.(about(s1,x2) & n_thing(x2) & Theme(s1,x1) & a_upset(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_seem(e1) & n_lady(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2))