【现在完成时练习题】现在完成时是英语中非常重要的时态之一，常用于表示过去发生的动作对现在造成的影响或结果。掌握好现在完成时的用法和结构，有助于提高英语表达的准确性。以下是一些关于现在完成时的练习题，并附上答案总结。
一、练习题
1. I ______ (eat) breakfast already.
2. She ______ (not finish) her homework yet.
3. They ______ (visit) Paris twice.
4. He ______ (work) here since 2015.
5. We ______ (not see) the movie yet.
6. Have you ever ______ (travel) abroad?
7. The children ______ (clean) their room.
8. I ______ (lose) my keys. Can you help me?
9. She ______ (just finish) her project.
10. Have they ______ (arrive) yet?
二、答案总结（表格形式）
| 题号 | 题目 | 正确答案 | 解析 |
| 1 | I ______ (eat) breakfast already. | have eaten | 表示动作已完成，对现在有影响 |
| 2 | She ______ (not finish) her homework yet. | has not finished | “yet”用于否定句，强调未完成 |
| 3 | They ______ (visit) Paris twice. | have visited | 表示过去某段时间内重复发生的行为 |
| 4 | He ______ (work) here since 2015. | has worked | “since”引导时间状语，表示从过去某一时间持续到现在的动作 |
| 5 | We ______ (not see) the movie yet. | have not seen | 否定句中“yet”表示尚未发生 |
| 6 | Have you ever ______ (travel) abroad? | traveled / travelled | “ever”用于疑问句，询问经历 |
| 7 | The children ______ (clean) their room. | have cleaned | 表示动作已完成，结果为房间干净 |
| 8 | I ______ (lose) my keys. Can you help me? | have lost | 表示刚刚丢失，对现在有影响 |
| 9 | She ______ (just finish) her project. | has just finished | “just”表示动作刚刚完成 |
| 10 | Have they ______ (arrive) yet? | arrived | “yet”用于疑问句，询问是否已经到达 |
三、小结
现在完成时的结构为：have/has + 过去分词。它常用于以下几种情况：
- 表示过去发生的动作对现在有影响。
- 表示从过去某一时间持续到现在的动作（常与“since”或“for”连用）。
- 表示到目前为止的经历（常与“ever”、“never”、“already”、“yet”等连用）。
通过多做练习并结合语境理解，可以更好地掌握现在完成时的使用方法。希望这份练习题能帮助你巩固这一重要时态！
