The lady was digging a deep hole to plant the tree.
The best time to plant a tree was rainy season
The lady can plant a tree any time she pleases, not only during the rainy season.
exists e1 p1 s1 x1 x2 x3.(n_tree(x3) & n_lady(x1) & Topic(e1,p1) & exists e2.(Theme(e2,x3) & Actor(e2,x1) & v_plant(e2)) & Theme(e1,x2) & Actor(e1,x1) & v_dig(e1) & n_hole(x2) & a_deep(s1) & Theme(s1,x2))
exists p1 p2 s1 x1.(n_time(x1) & r_most(s1) & a_good(s1) & Theme(s1,x1) & exists s2 x3.((x1 = x3) & n_season(x3) & a_rainy(s2) & Theme(s2,x3)) & Topic(x1,p1) & exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_plant(e1) & n_tree(x2)))