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It's supposedly notified, and they're still not here.
It's already started, and they're still not here.
It's the agreed time, and they're still not here.
Could you save a seat in advance?
It's half an hour late, and they're still not here.
Could you prepare the materials in advance?
It's already past the time, and they're still not here.
Could you make a booking in advance?
It might be nice to take a photo to remember it.
Could you let him know in advance?
It might be nice to wrap up early.
Could you look up the route in advance?