This person is skiing.
this person is skiing he is competing in  biathlon
Not every skiing person is competing in a biathlon.
exists p1 x1.(n_person(x1) & exists x2.((x1 = x2) & n_skiing(x2)))
exists e1 p1 x1.(n_male(x1) & n_person(x1) & exists e2 x2.(in(e2,x2) & n_biathlon(x2) & Actor(e2,x1) & v_compete(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_ski(e1))