Uses
1. To show a contrast or relationship
2. To show a thought that does not reach its end
3. For an interrupting idea (stronger than brackets)
4. To set apart an explanation to end a sentence (a second ending to a sentence)
To show a contrast or relationship
Tomorrow is daddy-daughter day at work
To show a thought that does not reach its end
“Come here” he shouted, “I’m going to kill – .” But before he could finish she was gone.
For an interrupting idea (stronger than brackets)
They ordered a bottle of whisky – their second one, and this one more expensive than the last – and sat down at the bar.
To set apart an explanation to end a sentence (a second ending to a sentence)
He spoke quickly about some monster, and they didn’t believe him – it all seemed so implausible.