A few people are planting flowers.
They are pulling weeds.
Flowers are not weeds.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_plant(e1) & n_flower(x2) & n_people(x1) & a_few(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_pull(e1) & n_weed(x2))