A group of men in suits are playing tubas.
A group of professional musicians play tubas.
You can not infer they are professional.
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_play(e1) & n_tuba(x4) & of(x1,x2) & in(x2,x3) & n_suit(x3) & n_man(x2) & n_group(x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_tuba(x3) & of(x1,x2) & n_musician(x2) & a_professional(s1) & Theme(s1,x2) & n_group(x1))