A man plays an instrument next to a drummer.
The man knows the drummer.
The man does not necessarily know the drummer.
exists e1 x1 x2 x3.(to(e1,x3) & n_drummer(x3) & r_next(e1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_instrument(x2) & n_man(x1))
exists e1 x1 x2.(n_drummer(x2) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_know(e1))