"on" 和 "by" 在表示时间上有明显的区别。
"on" 表示具体的某个时间点,比如说具体的日期或某个星期几:
- I will meet him on Friday.(我会在周五见他。)
- We always have pizza on Sunday nights.(我们通常在星期天吃披萨。)
"by" 则表示某个事件或任务的最后期限或完成时间,通常强调在之前完成:
- Please finish the report by the end of the week.(请在本周末前完成这份报告。)
- I need to get dressed by 7 o'clock.(我需要在7点之前穿好衣服。)
以下是3条“on”和3条“by”的举例:
On:
1. Birthday party is on the 15th of August.(生日聚会在8月15日举行。)
2. We have a test on Monday.(星期一我们有考试。)
3. The train arrives on time.(火车准时到站。)
By:
1. Please complete the assignment by tomorrow.(请在明天之前完成这项作业。)
2. I need to buy the tickets by the end of this month.(我需要在本月底之前购买门票。)
3. The package is expected to arrive by next Monday.(这个包裹预计在下周一之前到达。)
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