The bird is carrying a plant in its mouth while flying.
There is a plant in the air.
If the bird is carrying the plant while flying, then the plant must be in the air.
exists e2 e1 x1 x2 x3.(n_mouth(x3) & of(x3,x1) & n_thing(x1) & n_bird(x1) & while(e1,e2) & Actor(e2,x1) & v_fly(e2) & Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & in(x2,x3) & n_plant(x2))
exists p1 x1 x3.(n_air(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_plant(x2)))