According to me in present perfect continuous helping = verb is has been and have been पहचान = रहा है and timing is also given okay
In past perfect tense helping verb = had been and पहचान = रहा था timing is also given okay

The main difference is to find in Hindi that present perfect continuous ke last mein रहा है लिखा होगा and in past perfect continuous tense mein रहा लिखा होगा okay

Introduction:
The past perfect continuous and present perfect continuous are both verb tenses used in English grammar to express actions that happened in the past and are still ongoing or relevant to the present. While they share similarities, there are distinct differences between them in terms of the time frame and usage.

Differences between past perfect continuous and present perfect continuous:

Time frame:
- Past perfect continuous: This tense is used to describe an ongoing action that started in the past and continued up until another point in the past. It emphasizes the duration or length of the action.
- Present perfect continuous: This tense is used to describe an ongoing action that started in the past and is still continuing in the present. It emphasizes the duration or repetition of the action.

Usage:
- Past perfect continuous: This tense is often used to show the cause or reason for a past event or to describe an action that was interrupted by another action in the past.
Example: I had been studying for three hours before I took a break. (The action of studying started in the past and continued for three hours until it was interrupted by the break.)

- Present perfect continuous: This tense is often used to describe an action that started in the past and is still ongoing in the present. It is commonly used to talk about recent or current activities.
Example: I have been working on this project for the past week. (The action of working started in the past and is still continuing in the present.)

Formation:
- Past perfect continuous: The past perfect continuous tense is formed by using the auxiliary verb "had" in the past perfect tense, followed by "been" and the present participle form of the main verb (-ing form).
Example: She had been running for an hour before she got tired.

- Present perfect continuous: The present perfect continuous tense is formed by using the auxiliary verb "have" or "has" in the present perfect tense, followed by "been" and the present participle form of the main verb (-ing form).
Example: They have been playing tennis since morning.

Conclusion:
In summary, the past perfect continuous is used to describe an ongoing action that started and ended in the past, while the present perfect continuous is used to describe an ongoing action that started in the past and is still continuing in the present. Understanding the differences between these tenses can help learners accurately convey the timing and duration of actions in English.