Em dashes are used in place of parentheses. Use dashes to attract emphasis to the parenthetical information. Use parenthesis to insert the parenthetical text more quietly. When using dashes instead of parentheses, the surrounding punctuation should be ignored. In all three cases, "went" applies.
A pair of em dashes can be used instead of parentheses. Dashes are less formal than parentheses, but they are also more noticeable.
In this example, use of dashes replaces the need for parentheses.
The team and individual dash styles are used to show omission or interruption. The team is made up of two dashes. One on each side of the period or sentence-ending punctuation that follows them. Omission marks can be combined with other omission marks to show multiple items have been left out. Interruption marks are similar to omission marks, except that they indicate that something was dropped from the sentence. So, in the first example, the sentence as a whole makes no sense because "we don't like green eggs" has been dropped.
"Dots and commas"
Use dashes instead of commas. When constructing a parenthetical or interruptive statement, em dashes can be used in pairs to replace commas. The dashes have a somewhat more dramatic tone, drawing the reader's attention to the information contained within the special markings.
In professional writing, use an em dash sparingly. Em dashes may be used in place of commas, semicolons, colons, and parentheses in informal writing to signify increased emphasis, an interruption, or a sudden shift of thinking. In formal writing, these same functions are served by using ellipses (three periods...).
In formal writing, a semicolon would be used here. An en dash is similar to an em dash, but it's only half as wide.
Dashes and parenthesis signify a "aside" from the main subject of your phrase. Although they are frequently used interchangeably, each serves a distinct purpose in your writing. Parentheses softly add information to your argument, whereas dashes disrupt your writing to inject an interjection or halt.
Using parentheses: You can use parentheses to introduce an aside issue without overtly disrupting the flow of your essay. For example, you might use this device to note that while discussing Jane Austen's Pride and Prejudice, you would like to discuss its relevance in today's society. Parentheses are easy to insert into any sentence, so they are well suited for adding emphasis or clarification to your work.
Using dashes: Dashes are used to signal the interruption of the narrative flow of your essay, or an addition/deletion from the main topic. For example, if you were writing about Jane Austen's life and you wanted to include a footnote explaining that she died in 1817, you could do so by inserting this dash into your text: 17-18. The footnote would then appear at the end of your essay.
Parentheses vs. dashes: Because parentheses are used to briefly mention something outside of the main topic of your essay, they should be used only when necessary. If you feel the need to include a sidebar issue in your work, then you should consider using a dash instead.
Dashes Em Dashes When alternative punctuation might be inappropriate, em dashes come to the rescue. Em dashes, for example, can be used to substitute parentheses at the conclusion of a sentence or when several commas exist in a parenthetical phrase. The second baseman leaped for the ball after a split second of uncertainty (or, rather, limped for it).
Em dashes are also used as horizontal dividers between entries in a list. These can be either literal dashes or hyphens. Since these are lists, the information being divided is usually related in some way.
Finally, em dashes can be used to indicate omitted text. This is most commonly done when quoting from another source.
An example using all three methods for indicating punctuation: John, James, George, and Charles William Frederick Louis Napoleon III, better known as Prince Napoleon, was an emperor of France who was born in 1808. He ruled from 1848 until his death in 1879, during which time he orchestrated many political changes that led to the creation of the Second French Empire. His reign is considered a disaster by many historians because of his foolishness in trying to copy what he had seen done well in Europe and America and then try to force it upon an unwilling people. He also destroyed much of the goodwill generated by France's victory over Napoleonic France in 1815. Although he claimed to be a monarch, he was really just a figurehead who could not govern without Parliament or the Senate voting on issues before them.