We're going to set off for a walk. Do you want to come? JUST ABOUT
We're just about to set off for a walk. Do you want to come?
The train arrives at Glasgow Central at 12.12. BE DUE
The train is due to arrive at Glasgow Central at 12.12.
It probably won't rain tomorrow. BE LIKELY TO / BE UNLIKELY
It isn't likely to rain tomorrow. It is unlikely to rain tomorrow.