A man sings on stage with a guitar.
This man can play an instrument.
A guitar is an instrument and being on stage implies the man can play.
exists e1 x1 x2 x3.(on(e1,x2) & with(x2,x3) & n_guitar(x3) & n_stage(x2) & Actor(e1,x1) & v_sing(e1) & n_man(x1))
exists e1 p1 x1.(n_man(x1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_play(e2) & n_instrument(x2)) & Topic(e1,p1) & Actor(e1,x1) & v_can(e1))