- once is part of the Basic English 850.
- Once I've finished cleaning up, we can leave.
- one time
- We go to the house once a year.
- She had only seen him once.
- It's nice to be understood for once.
- We get together once a month for coffee.
- at a time in the past, but not now
- It was hard to believe that once we had been friends.
- The once great city had be destroyed.