Which one is correct

I'm talking about the future ... so

Which one is correct  ?

I'm playing tennis on monday

I'll playing tennis on monday

I'm going to paly tennis on monday

I'm going to palying tennis on monday

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by the way is tis first clause is correct  is correct   I'm talking about the future

Hi,

Yes, these are all OK. However, I don't see them in terms of formal/informal, but thus -

I'm playing tennis on Monday My game is already 'scheduled'. Similar to 'My plane leaves on Monday at 9pm.

I'll be playing tennis on Monday Use in a context where two events/activities occur at the same time. eg A: Can you call me on Monday at 11am?

B: No, I'll be playing tennis on Monday at 11. I'll call you at 1pm, OK?

I'm going to play tennis on Monday In simple terms, 'going to' suggests a plan.

I'm going to be playing tennis on Monday See #2 above.

Best wishes, Clive