A man in a cherry picker trims a tree.
a man trimming a tree
Trimming a tree and trims a tree are different forms of the same phrase.
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_trim(e1) & n_tree(x4) & in(x1,x2) & n_picker(x2) & of(x2,x3) & n_cherry(x3) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_trim(e1) & n_tree(x3) & (x1 = x2) & n_man(x1))