Boys dragging a monkey on the African plains.
The musician is playing drums.
Boys implies more than one person, while musician implies only one person. Dragging a monkey is not the same as playing drums.
exists e1 s1 x1 x2 x3 x4.(n_plain(x4) & a_african(s1) & Theme(s1,x4) & a_topic(x1) & on(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_drag(e1) & n_monkey(x3) & (x1 = x2) & n_boy(x1))
exists e1 x1 x2.(n_musician(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_drum(x2))