You need to help to change the film in your camera. You ask Kate: YOU: I don't know how to change the film. KATE: Sure. It's easy. All you have to do is this. ___

What would you say in these situations?

Example: Paul has come to see you in your flat. You offer him something to eat:

YOU: Would you like something to eat?

PAUL: No, thank you. I've just eaten.

You need to help to change the film in your camera. You ask Kate:

YOU: I don't know how to change the film.

KATE: Sure. It's easy. All you have to do is this. ____________.