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This is Everyday Grammar. I'm Kaveh.
欢迎收看《每日语法》栏目，我是卡维。
And I'm Lucija. When English speakers talks about time and place,
我是露西佳。当说英语的人谈论时间和地点时，
they use these three little words a lot:In, On and At.
常会用到三个小词：In, On 和 At。
In, On and At are prepositions.
In, On和At都是介词。
An easy way to know how they work is to look at how they describe time or place.
了解它们作用的一个简单方法是看它们如何描述时间或地点。
And whether their descriptions are general or specific.
以及它们的描述是具体还是一般。
A general description of time refers to periods, months, years and centuries.
对时间的一般描述是指周期、月、年和世纪，
here, you use the preposition In.
这时你要用介词In。
Like, in the morning, in April, in 2017, in the 21st century.
比如，in the morning（在早上），in April（在四月），in 2017（在2017年），in the 21st century（在21世纪）。
For more exact time description, like the days of the week, holidays and dates, use On.
对于时间的更精确描述，比如一周的哪一天，假期和日期，要用On。
At is used to be even more specific: at 1p.m., at noon, at 7 o'clock.
At用于更具体的描述，比如at 1p.m.（在下午一点）, at noon（在中午）, at 7 o'clock（在7点）。
This model also applies to places.
这个模型也适用于描述地点。
Use In for general locations, like neighborhoods, cities, and countries.
In用于描述一般的地点，比如街区，城市和国家。
I live in Washington.
我住在华盛顿。
Let's meet in Chinatown.
我们在唐人街见面吧。
Use On for more specific locations, such as streets, avenues, large vehicles and islands.
On用于更具体的描述，比如街道，大街，大型车辆和岛屿。
I work on M street.
我在M街工作。
I'm on the train.
我在火车上。
And use At when you are talking about a very specific place,
At是在讨论一个非常具体的地点时使用的，
such as an address or specific location.
比如地址或具体地点。
She's at home.
她在家。
Let's meet at 330 K street.
我们在330 K大街见面吧。
