A motorcyclist on the street.
A human is outside
A motorcyclist is a human and being on the street, where motorcycles are found usually, means the human is outside
exists x1 x2.(n_street(x2) & a_topic(x1) & on(x1,x2) & n_motorcyclist(x1))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_human(x1))