Phrases Offering and Refusing Help

I'm afraid I'm rather tied up at the moment.

C2

Meaning

I'm too busy to help right now.

Example sentences

John: 'I'm afraid I'm rather tied up at the moment. Perhaps tomorrow?'

Alice: 'Could you possibly help me with the presentation?'<br>

John: 'Would you be available to proofread my essay?'<br>

Alice: 'I'm afraid I'm rather tied up at the moment. I have a pressing deadline.'