Referring to this : Usage of a comma for emphasis

I don't really get the difference between "—", comma and ":" in the case of putting emphasis in some sentences like this:

1- Don't forget, they could be tricking us.

2- Don't forget: They could be tricking us.

3- Don't forget — they could be tricking us.

If there isn't any difference between those, which one is more proper for using?

And another puzzling thing for me is: in each case ( 1, 2, 3) which part of the sentence is emphasized and has more weight?

(I think that my question is not duplicate, since I am asking about comparing three signs: "—", comma and ":". Which is not really answered in the mentioned "possible duplicate".)

closed as off-topic by Edwin Ashworth, user140086, NVZ, tchrist, ab2 Jul 10 '16 at 0:57

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  • 1
    Possible duplicate of Interchangeability of "--" (dash) and ":" (colon) – Edwin Ashworth Jul 5 '16 at 21:07
  • 2
    The comma would be considered incorrect by some as it joins two independent clauses. I'd use it if I wanted to signal a slight pause only. The colon and dash are equivalent, signalling a longer pause and more abrupt transition. But the colon is rather old-fashioned here, and the capitalisation following it very rare. – Edwin Ashworth Jul 5 '16 at 21:11

The comma is incorrect. It should be used to conjoin the two parts of the sentence or create a pause. The dash is also incorrect. It should also be reserved for joining two portions of a sentence, or perhaps implying a longer pause. Or in a mathematical equation. Although, it might be considered old fashioned, the perfect punctuation for these purposes is the colon. In your example, however, the next word should not be capitalised.

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