介词（preposition 简写prep.）又称作前置词，表示名词、代词等与句中其他词的关系，在句中不能单独作 句子成分 。介词可以分为时间介词、地点介词、方式介词、原因介词、数量介词和其他介词。这节课，ROSY老师带领大家学习的是——时间介词。通过四张图彻底搞定。
一张图搞清楚Aｔ＼Ｏｎ＼Ｉｎ用法
以下三张图是At、On 、In的具体用法对比
下面是具体示例
时间介词: IN用于非特定时间，如: years, months.
In Parts of the day一天的某部分
Examples:
- In the morning早上
- In the afternoon下午
- In the evening晚上
In Months月份
Examples:
- In January一月
- In February二月
In Seasons季节
Examples:
- In (the) spring春天
- In (the) summer夏天
IN Years年
Examples:
- In 1980
- In 1969
In Decades年代
Examples:
- In the 1960s
- In the seventies
In Centuries世纪
Examples:
- In the 15th century
- In the 21st century
IN Weeks周
Examples:
- In a week
- In 2 weeks
IN Periods of time持续一段时间
Examples:
- In the past
- In the next century
- In the future
- In the middle ages
- In a moment
IN Holidays节假日
Examples:
- In the Easter holiday
这个介词用于： dates（日期）, days of the week（星期） and holidays with “day”（包含具体日期的假日）.
On Days
Examples:
- On Monday
- On Thursday
- On Sunday
On Dates
Examples:
- On April 3rd
- On 1st January 2013
- On the 10th
- On the first day
On Holidays with “day”
Examples:
- On New Year’s day
- On Christmas day
- On Easter day
On Specific days
Examples:
- On my birthday
- On my wedding day
- On that day
On Time
Examples:
- On the weekend (U.S.)
- On weekdays
- On time
- On a summer evening
On Day Part of day
Examples:
- On Sunday morning(s)
- On Friday afternoon(s)
- On Monday evening(s)
这个介词用于： specific times（特定的时间） and holidays without “day”（不包含具体日期的假日）.
At Hours
Examples:
- At 7 am
- At 12 o’clock
At Parts of the day
Examples:
- At night
- At noon/ midday
- At midnight
At Holidays without “day”
Examples:
- At Easter
- At Christmas
- At New Year
At Time
Examples:
- At present
- At the weekend (U.K)
- At breakfast
- At the moment
