Present Perfect

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Topics Covered in Present Perfect

1. Formation:
- Structure: have/has + past participle.
- Example: I have seen that movie.

2. Usage:
- Unspecified time: She has visited Paris.
- Experiences: Have you ever tried sushi?
- Duration with "since/for": We have known each other for ten years.

3. Key Words:
- already, yet, ever, never, since, for.

4. Common Errors:
- Forgetting have/has.
- Mixing since and for.
- Using simple past instead of present perfect.