The present perfect tense is used to talk about actions or events that started in the past and are still relevant or have an impact on the present. It is formed by using the auxiliary verb “have” or “has” followed by the past participle of the main verb.

The present perfect tense is often used to talk about experiences, achievements, or actions that have occurred at an unspecified time in the past. It is also used to talk about actions that have just been completed or have a connection to the present moment.

For example: - I have visited Paris several times. (experience) - She has won many awards in her career. (achievement) - They have just finished their homework. (just completed) - We have lived in this house for ten years. (connection to the present)

The present perfect tense is also used to talk about actions that started in the past and are still ongoing. It emphasizes the duration or continuity of the action.

For example: - He has been studying English for five years. (ongoing action) - They have been working on this project since last month. (duration of the action)

In summary, the present perfect tense is used to talk about past actions or events that are still relevant or have an impact on the present, as well as ongoing actions that started in the past.