Scheduled to stay the night with 〜ことになっている
Grammar Explanation: Past decision still in effect with 〜ことになっている

After a day playing at the beach, Hikari asks Shindou when someone is coming to pick everyone up. Shindou says it will be “tomorrow evening”.
- 神藤:
- 「今日
( はウチの別荘( に泊( まることになっているって言( っただろう?」- “Didn't I say we're scheduled to stay the night at my villa?”
- Literal: “I said that today it has become the thing that we're staying at my villa, right?”
- “Didn't I say we're scheduled to stay the night at my villa?”
Key Points
1泊まることになっている means the arrangement is already set
- The group is scheduled to stay at Shindou’s villa tonight.
- The pattern points to an existing plan, not a decision being made in this moment.
2って言っただろう reminds the listener
- Shindou says he already told them this.
- だろう expects Hikari to recognize or remember the information.
3今日は frames the specific time
- 今日
( は limits the arrangement to tonight. - Tomorrow evening pickup only makes sense because tonight has already been decided.
See Also
- Grammar: Quoting and reporting with と and って
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