"Both are valid reductions, but without 'being', 'shown' alone could be a reduction of 'which was shown'-- so the movie could be finished." (Tight (no spaces) on left side of word; single space to the right of word.)
Yes or no? Would you punctuate these sentences with the dash like this (your style)? Please carefully note the spaces.
We will fly to Paris in June-- if I get a raise.OK?
1 or 2 the way you prefer?
Smith offered a plan-- it was unprecedented-- to raise revenues. Smith offered a plan-- it was unprecedented --to raise revenues.
Top answer
I don't want to carefully note the spaces, victo. This is an informal medium. I'm not even using an m-dash-- I'm using two hyphens.
— Mister Micawber
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I don't want to carefully note the spaces, victo. This is an informal medium. I'm not even using an m-dash-- I'm using two hyphens. I have to hit 4 keys to make an m-dash, and I have better things to do with my free time.
Technically, a single space goes on both sides. Others may prefer the dash to be flush on each side.
I personally have a predilection for the spaces but not the two-hyphen method. I like the 'Mudge Dash,' a dash I named after Rich Turner, owner and operator of The Grammar Curmudgeon.