约时间，别让介词添乱

Jia wants to meet a friend at the city library. Her first message says, 'Let's meet at ten on Saturday.' At introduces the clock time, while on introduces the day. Her friend agrees, but asks whether she means the coming Saturday or the following one.

小佳想约朋友在市图书馆见面。第一条消息写道：Let's meet at ten on Saturday。at 引出钟点，on 引出星期几。朋友同意了，但问她指这个周六还是再下一个。

Jia rewrites the invitation: 'Let's meet on 12 September at 10 a.m.' For a longer period, she might say, 'Our reading club starts in September.' 'On September' is not the pattern for a month alone. A full date, however, uses on.

小佳把邀请改为：我们 9 月 12 日上午 10 点见。说较长时间段时，可以说读书会 in September 开始。月份单独出现时不用 on September，但完整日期前使用 on。

Her friend replies, 'I am busy this Saturday. Could we meet next week?' Time phrases beginning with this, next or last usually need no at, on or in. Write 'next week', rather than 'in next week', when you mean the following calendar week.

朋友回复：我这个周六有事，我们下周见可以吗？this、next、last 开头的时间短语通常不用 at、on、in。表示下一个日历周时，说 next week，而不是 in next week。

For an online chat with someone abroad, Jia adds 'Beijing time, UTC plus eight' and writes the date in words. She does not assume everyone shares her local time. She also learns that British 'at the weekend' and American 'on the weekend' are both normal; clarity matters more than choosing one accent.

和在国外的人线上聊天时，小佳补充‘北京时间，UTC+8’，并把月份写成英文单词。她不默认所有人都处于同一时区。她还了解到，英式 at the weekend 和美式 on the weekend 都是正常用法；表达清楚比选定某一种口音更重要。

Can we talk next week, on Tuesday at eight?

我们下周二八点聊可以吗？

Could we meet on 15 September at 8 p.m. Beijing time?

我们能在北京时间 9 月 15 日晚上 8 点见面吗？