Suppose that you`ve already had your schedule and your colleague asks if you are working tomorrow, which one sounds better English:
1. I start at 13 tomorrow.
2.I`ll start at 13 tomorrow.
3. I`m starting ....
Thank you .
Natural English is this. Tom: Are you working tomorrow? Jim: Yes, I'm starting at one o'clock.
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Natural English is this.
Tom: Are you working tomorrow?
Jim: Yes, I'm starting at one o'clock.
Ryann1. I start at 13 tomorrow.
This doesn't mean anything. You could say at 1pm.