【现在完成时标志词】在英语语法中，现在完成时是一个非常常见的时态，用于表达过去发生的动作对现在的影响或持续到现在的状态。为了正确使用现在完成时，我们需要了解一些常见的“标志词”（即时间状语），它们可以帮助我们判断是否应该使用现在完成时。
下面是对现在完成时常用标志词的总结，并附有表格形式的清晰展示。
一、现在完成时标志词总结
1. already：表示某事已经发生，通常用于肯定句中。
- 例句：I have already finished my homework.
2. yet：常用于疑问句和否定句中，表示“还……没有”。
- 例句：Have you finished your work yet?
3. ever：用于疑问句中，询问经历。
- 例句：Have you ever been to Paris?
4. never：表示从未做过某事，常与ever连用。
- 例句：I have never seen such a beautiful place.
5. just：表示刚刚发生的事情。
- 例句：She has just left for school.
6. recently：表示最近发生的事情，时间范围较短。
- 例句：He has recently moved to London.
7. lately：与recently类似，也表示最近一段时间内。
- 例句：I haven’t seen him lately.
8. since：表示从过去某一时间点开始一直持续到现在。
- 例句：I have lived here since 2015.
9. for：表示动作持续的时间长度。
- 例句：They have been friends for five years.
10. this week/month/year：表示从本周/本月/本年开始以来。
- 例句：Have you seen the movie this week?
11. in the past few days/months：表示在过去几天或几个月里。
- 例句：I have received several emails in the past few days.
12. up to now：表示到目前为止。
- 例句：Up to now, we have completed half of the project.
二、现在完成时标志词表格
| 标志词 | 用法说明 | 例句 |
| already | 表示某事已经发生 | I have already eaten. |
| yet | 用于疑问句或否定句，表示“还未” | Have you finished your dinner yet? |
| ever | 用于疑问句，询问经历 | Have you ever traveled by plane? |
| never | 表示从未做某事 | I have never met her before. |
| just | 表示刚刚发生 | She has just called me. |
| recently | 表示最近发生 | He has recently changed jobs. |
| lately | 表示最近一段时间内 | I haven’t heard from him lately. |
| since | 表示从过去某一时间点开始到现在的 | I have worked here since 2018. |
| for | 表示动作持续的时间长度 | They have known each other for ten years. |
| this week/month/year | 表示从本周/月/年开始以来 | Have you studied English this month? |
| in the past few days/months | 近期发生的事 | I have had a lot of meetings in the past few days. |
| up to now | 表示到目前为止 | Up to now, we have made 100 units. |
通过掌握这些标志词，我们可以更准确地判断何时使用现在完成时，从而提高英语表达的准确性与自然度。希望这份总结能帮助你在学习过程中更加得心应手。
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