Rules of Present Perfect Tense

Present Perfect tense is used to talk about actions or events that happened in the past but have a connection to the present. It is formed by using the auxiliary verb "have" or "has" followed by the past participle of the main verb.

Key Concepts:
1. Formation: Subject + have/has + past participle
वाक्य रचना: कर्ता + have/has + वर्तमान काल की पूर्ण रूप

2. Use:
a. To talk about an action that started in the past and is still continuing in the present.
उदाहरण: She has lived in this city for five years.
b. To talk about an action that happened at an unspecified time in the past.
उदाहरण: I have visited Paris.
c. To talk about an action that happened in the past but has a result or impact on the present.
उदाहरण: They have finished their homework.

Usage Examples:
1. I have studied English for three years.
मैंने तीन साल से अंग्रेजी पढ़ी है।

2. She has already eaten lunch.
उसने पहले ही दोपहर का खाना खा लिया है।

3. We have seen that movie before.
हमने पहले से वह फिल्म देखी है।

Key Mistakes:
1. Incorrect use of "have" and "has" based on the subject.
गलत तरीके से "have" और "has" का प्रयोग करना।
Example: He has went to the store. (Incorrect)
He has gone to the store. (Correct)

2. Using the present perfect tense for past actions with specific time references.
विशेष समय संदर्भ के साथ पिछले कार्यों के लिए प्रेजेंट परफेक्ट टेंस का प्रयोग करना।
Example: I have seen her yesterday. (Incorrect)
I saw her yesterday. (Correct)

By understanding the rules of Present Perfect tense and avoiding common mistakes, you can improve your English speaking and writing skills.