Dashes have two main functions. One, they can be used in place of commas in order to set off a certain part of a sentence.
Or, two, they can be used to show a pause in a quotation.
So, let’s take a look at the first use:
“Two states on the West Coast – Washington and Oregon – have amazing weather.”
So, right here, “Washington and Oregon” could be omitted from the sentence. So, try reading this sentence without “Washington and Oregon” in the sentence.
“Two states on the West have amazing weather.”
That sentence still makes perfect sense, so “Washington and Oregon” is just extra information.
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