When an actor or actress speaks in a foreign language in a movie scene, for example when Scarlett Johansson spoke Russian in The Avengers, do they practice the language or do they
![Scarlett Johansson: 'Of course I've got a big ego - I am an actor and all actors think they're the one' | Daily Mail Online Scarlett Johansson: 'Of course I've got a big ego - I am an actor and all actors think they're the one' | Daily Mail Online](https://i.dailymail.co.uk/i/pix/scaled/2013/12/13/article-2521467-1A01A7E000000578-749_636x382.jpg)
Scarlett Johansson: 'Of course I've got a big ego - I am an actor and all actors think they're the one' | Daily Mail Online
![Scarlett Johansson on Motherhood, Superhero Workouts, and Her New Minimalist Beauty Brand | Vanity Fair Scarlett Johansson on Motherhood, Superhero Workouts, and Her New Minimalist Beauty Brand | Vanity Fair](http://media.vanityfair.com/photos/621cfe240e08be2e6cc3dd20/master/pass/scarlett-johansson-skin-care-tout.jpg)