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It's been a long time that I use English, no mention French.
Since I am from Taiwan. I live here and work here. 
Language is just for communication. I don't have any needs to communicate in different language. 
That isn't totally correct. 
Indeed, sometimes I reply some email in English. Most of them are the things that might be impolite when say it in Chinese. Or something that I don't know how to say it to my bosses. 
I think the Sociolinguistics may have an analyse for this act. 

It's time to bed. 
Good night.