A man is seated in a tree near a river.
A man is joining a group of tree monkeys.
There is nothing indicating tree monkeys or him joining anything.
exists e1 x1 x2 x3.(in(e1,x2) & near(x2,x3) & n_river(x3) & n_tree(x2) & Theme(e1,x1) & v_seat(e1) & n_man(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_join(e1) & of(x2,x3) & n_monkey(x3) & of(x3,x4) & n_tree(x4) & n_group(x2) & n_man(x1))