a guy wearing a gray t-shirt is shaving is face.
A guy is using an electric razor.
You can not infer he is using an electric razor.
exists e1 e2 p1 s1 x1 x2 x3 x4.(exists x5.((x1 = x5) & n_face(x5)) & Theme(e2,x3) & Actor(e2,x2) & v_wear(e2) & Actor(e1,x4) & v_shave(e1) & (x3 = x4) & n_t-shirt(x3) & a_gray(s1) & Theme(s1,x3) & (x1 = x2) & n_guy(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_razor(x2) & a_electric(s1) & Theme(s1,x2) & n_guy(x1))