How to use dash in English we kown that she tried to learn about every thing she found--I believe she would have much to say about the many countries she lived in. Why change a dash to a semicolon?

Oh, I can't find the usage of dash in English grammar books. But in Canada, no one ever uses dash. It's the same as people don't use our book's name. People don't have you
Some domestic teachers say that the function of dash is semicolon, which is right. But I want to remind you that if you use dash, you have to take the risk that foreigners can't understand it

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