A black dog is swimming while carrying a tennis
a black dog is swimming.
The black dog is swimming and continues to swim.
exists e2 e1 s1 x1 x2.(while(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_carry(e2) & n_tennis(x2) & Actor(e1,x1) & v_swim(e1) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists p1 s1 x1.(exists x2.((x1 = x2) & n_swimming(x2)) & n_dog(x1) & a_black(s1) & Theme(s1,x1))