How do you make a dash?
There's no punctuation dash on your keyboard. There's a hyphen and an underline, but not a dash. Some people use the hyphen various ways to improvise a dash, like these:
Our new computers - which will arrive next week - will be fast and cheap.
Our new computers--which will arrive next week--will be fast and cheap.
Our new computers -- which will arrive next week -- will be fast and cheap.
All of those, however, are improvising a real dash, which looks like this:
Our new computersówhich will arrive next weekówill be fast and cheap.
If you're using Microsoft Word for Windows, you can usually get a dash by typing two hyphensóWord will then use its AutoCorrect feature to automatically change the pair of hyphens into a real dash. Try it.
If that doesn't work, either of these will: