If we don't see each other today. There mightn't be another chance again. VS The

[B45]

If we don't see each other today.

There mightn't be another chance again.

VS

There mightn't be another chance.

Are both okay?

 

[MikeNewYork]

Your first phrase is not a sentence. The period/full stop is incorrect. It should be a comma. "Again" is not needed.

If we don't see each other today, there mightn't be another chance.

 

[SoothingDave]

I don't think I have ever said "mightn't."

 

[MikeNewYork]

I haven't either, but it appears to exist. Perhaps it is used more in BrE.

 

[Rover_KE]

Not especially.

Batman has a propensity for coining his own, previously unknown, contractions.

 

[emsr2d2]

I wouldn't say we use it extensively but it's perfectly acceptable and recognisable. It sounds rather old-fashioned to me. I would say "There might not be another chance" but, to be fair to Batman, that is exactly the same sentence but without the contraction.

In fact, I have just realised I used "mightn't" today at work!