Consider the example
Proper nouns (such as names) and multi-word eponyms do not usually take hyphens—e.g., Josephson junction.
Would the preferred way to set off the dependent clause (the part after the em dash) be to use an em dash or a comma?
My understanding is that the em dash sets apart parenthetical phrases or clauses in a sentence. So I suppose that it sounds sound to use an em dash, or even a parenthesis.
On the other hand, correct me if I am wrong, but one couldn't use a semicolon here because the second clause is not independent?
So, we have the choice of (1) comma, (2) parenthesis, or (3) em dash.
How does one choose between these?
Best Answer
Wikipedia covers this:
To summarize, from weakest to strongest it's: comma
,
, parenthesis()
, and em dash–
.Dialogue favors commas and em dashes to help emphasize changes in tone, but parenthetical grouping has an advantage in technical writing for its nesting abilities.
It's still largely up to personal preference.