A group of people are on a work boat that is in the water.
Some people are riding a boat.
group of people are on a work boat implies Some people are riding a boat.
exists p1 x1 x2 x6.(n_water(x6) & exists p2 x3 x4 x5.(on(x1,x3) & in(x5,x6) & (x3 = x5) & n_boat(x3) & of(x3,x4) & n_work(x4)) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_boat(x2) & n_people(x1))