The man and woman are sitting by the boats.
A man sits alone on a rock near the boat
Either the man is alone or with a woman.
exists e1 x1 x2 x3 x4.(n_boat(x4) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1) & by(e1,x4) & Actor(e1,x1) & v_sit(e1))
exists e1 s1 x1 x2 x3.(n_boat(x3) & on(e1,x2) & near(x2,x3) & n_rock(x2) & a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_man(x1))