Check in 表示抵达酒店办理入住，或在航班起飞前办理值机；check in luggage 则表示交运行李。工作中的 check in with someone 表示联系某人，了解事情进展。名词 check-in 带连字符。
想在对话中用 check in 吗？
写一句英语，查看错误和更自然的表达建议。
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check in (at + hotel/desk); check into + hotel; check in for + flight; check in + luggage; check in with + person
- If you arrive early, you can leave your bags at reception before you check in.
- You can check in for your flight online a day before departure.
- I'll check in with the team on Friday to see how the project is going.
修改原因
修改前We checked in the hotel around midnight and went straight to bed.
修改后We checked in at the hotel around midnight and went straight to bed.
不加介词，hotel 就像 check in 的宾语，类似 check in your bags，意思是交运行李。要说明地点，可用 at，或改成 check into：checked in at the hotel、checked into the hotel。这里补上 at 即可。
Register 表示把名字登记到名单上、报名注册：register for a course、register on a website。Check in 则是报到，说明已经抵达：check in at reception。这里酒店和机场的到达手续用 check in。
动手练习
We arrived at the airport early and ___ our suitcases before having breakfast.
查看答案
checked in — 在机场交运行李用 check in，所以选 checked in。即使这个流程涉及登记，英语也不把这里的托运行李说成 register bags。
描述最近一次乘飞机或住酒店的经历。说明在线还是到柜台办理手续，以及花了多久。
Before my flight to Istanbul, I checked in online, and the whole thing took less than five minutes.
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