A man in a striped shirt lifts a log in a playground.
A man is working on building a playground.
A man lifting a log in a playground is not necessarily working on building a playground.
exists e1 s1 x1 x2 x3 x4.(in(e1,x4) & n_playground(x4) & Theme(e1,x3) & Actor(e1,x1) & v_lift(e1) & n_log(x3) & in(x1,x2) & n_shirt(x2) & a_striped(s1) & Theme(s1,x2) & n_man(x1))
exists e1 e2 x1 x2 x3.(on(e1,e2) & Theme(e2,x3) & Actor(e2,x2) & v_build(e2) & n_playground(x3) & Actor(e1,x1) & v_work(e1) & n_man(x1))