When a toddler is verbal, especially at the one- to three-word phrase level, the interventionist can build on what the toddler says, thereby demonstrating more linguistically sophisticated options, as in this script:
Toddler (with toy cars): “Car.”
Interventionist (pushes car): “Car. Go, car!”
Toddler: “Go, car!”
Interventionist: “Go, car! Fast!”