It varies, largely depending on how much time and resources they’re willing to devote. The easiest thing is to just have the actors make up a bunch of nonsense sounds on the spot, but then there is no consistency.
The next easiest thing is a cipher, just replacing one word with another and still using English grammar. That is fairly common.
But creating brand new languages is not actually that hard, so it is done pretty regularly, especially if it is being done for media that is going to last a long time. Dothrakhi and Klingon, for example, are both actual languages at this point with their own rules of grammar and vocabulary.
Latest Answers