An engineer is working alone near his machines.
An engineer was at work on the machine
It cannot be inferred that the engineer was working on the machine.
exists e1 s1 x1 x2.(near(e1,x2) & n_machine(x2) & of(x2,x1) & n_male(x1) & a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_engineer(x1))
exists p1 x1 x3.(n_machine(x3) & exists x2.(at(x1,x2) & on(x2,x3) & n_work(x2)) & n_engineer(x1))