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That's what some bilingual kids do when they talk to each other. They switch between languages flawlessly and mid-sentence. Drives me nuts when I'm listening to them. Similar effect you get when you live abroad for a while, there's certain idioms you can easily express in another language/culture but you won't find the words in your native language.

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Not only that, sometimes we do forget how sonething used to be called, or we only learned the expressions in the context of the foreign language.

So when speaking with others that share the same language knowledge, it is just less effort to do so than pause while trying to remember.

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