Dashes, when used sparingly and correctly, can be used to make your
writing sound more sophisticated.
When to use dashes
Use
dashes to . . .
Reason
Example
Indicate
sudden changes in tone or thought within a sentence
To emphasize
the contradiction between ideas
There
is an illness in many foreign services--the people in them are only
good at following instructions.*
I am under the impression that she has no instructions
at all--and doesn't need any.*
The exuberant--I should say lunatic--quality of
his ravings electrified the crowd. *
Set
off some sentence elements
To
insert parenthetical commentary while emphasizing their importance
(Parentheses tend to diminish the importance of
what's enclosed in them)
Over
a candlelit dinner last month at Spaso House, the ambassadorial
residence in Moscow, Robert Strauss and his wife Helen listened
as two Senators--Republican Robert C. Smith of New Hampshire and
Democrat John Kerry of Massachusetts--agreed that the way to bring
American audiences "out of their chairs" these days was
simply to say, in Smith's words, "We won the cold war, and
we're not going to send one dime in aid to Russia."*
Strauss favors--as does, sotto voce, the Administration--early
admission of Russia to the International Monetary Fund.*
Create
emphasis
To connect
ideas strongly to each other
To feed,
clothe, and find shelter for the needy--these are real achievements.