A yellow construction machine is digging.
A construction machine is working.
Digging is the action of working.
exists e1 s1 x1 x2.(Actor(e1,x1) & v_dig(e1) & n_machine(x1) & of(x1,x2) & n_construction(x2) & a_yellow(s1) & Theme(s1,x1))
exists e1 x1 x2.(Actor(e1,x1) & v_work(e1) & n_machine(x1) & of(x1,x2) & n_construction(x2))