A guy surfing in the ocean.
A man is in the water.
A guy is a man, and ocean implies water.
exists x1 x2 x3.(n_ocean(x3) & a_topic(x1) & in(x1,x3) & Time(x1,x2) & n_surfing(x2) & n_guy(x1))
exists p1 x1 x2.(n_water(x2) & in(x1,x2) & n_man(x1))