英语作文中描述时间需根据具体语境选择合适的时间状语。以下是常用表达方法及示例：
一、表示时间点
at + 基数词 + o'clock（整点） - The meeting starts at 3 o'clock sharp.
- The train leaves at 7:45 PM.
on
+ 日期（具体某天）
- The party was held on October 1st.
- We celebrated National Day on the 1st of July.
on+ the + 序数词 + of + 月份
- The company launched its new product on the 15th of June.
二、表示时间段
in+ 年份/月份
- She was born in 1990.
- The project was completed in 2023.
- The company operates in January and February.
in+ 每隔固定时间
- The meeting is held every other Tuesday.
- The train arrives every 30 minutes.
in+ 世纪/年代
- The 21st century has brought many technological advancements.
- The 1960s were a golden age of music.
三、其他常用表达
last/next week/month： 用于计划或过去事件 The report is due next Monday. We visited our grandparents last summer. this/that day
This day, we achieved a major milestone.
That day, the weather was exceptionally sunny.
四、写作建议
时间状语前置：
使用时间状语时通常置于句首或句中，例如：
- At 8:00 AM, the meeting began. [in the morning]
- On the eve of the festival, we prepared the feast. [on the eve of]
灵活运用介词：
注意介词与时间词的搭配，如：
- The movie started at 9 PM[具体时间]
- The letter arrived in the morning[模糊时间]
结合时态：
时间状语需与句子时态一致，例如：
- Present Perfect：
- By the time we arrived, the meeting had already started. [in + 时间段]
- Past Simple：
- The letter arrived on Monday[具体日期]
通过以上方法，可有效提升作文中时间表达的准确性和丰富性。