A man wearing a large backpack is sitting in the grass near a lake.
A man is outside near some water.
A lake contains water and is outside, grass is found outside, therefore the man is outside near some water.
exists e2 e1 s1 x1 x2 x3 x4 x5.(n_grass(x4) & in(e2,x4) & near(x4,x5) & n_lake(x5) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_backpack(x3) & a_large(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists s1 x1 x2.(near(s1,x2) & n_water(x2) & Theme(s1,x1) & a_outside(s1) & n_man(x1))