出典:Tatoeba
They have been here for an hour.
They were just waiting for time to pass by.
They should have arrived long ago.
I'll wait here until they come back.
They will arrive soon.
"Do you know when they will arrive?" "At eleven-thirty this evening."
For that reason, they are saying that they need time.
But they will come here tomorrow.
They will come right away.
They thought that departing right away was important.