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Use of Past Perfect Continuous Tense 1. To show an action that started in the past and continued up to another point in the past It emphasizes the duration of the action before another past action. Example: She had been teaching for ten years before she retired. The students had been studying for two hours before the test began. 2. To show cause and effect in the past The ongoing action explains the reason for a past condition. Example: He was tired because he had been working all night. The ground was wet as it had been raining. 3. To emphasize how long an action was happening in the past Often used with for and since. Example: I had been waiting for the bus for thirty minutes when it arrived. We had been living in Hyderabad since 2010 before we moved.

Use of Present Perfect Continuous Tense 1. To show an action that started in the past and is still continuing in the present The emphasis is on the duration of the action. Example: She has been teaching English for five years. They have been preparing for the exams since morning. 2. To show an action that started in the past and has recently stopped, but its effect is still visible Example: He is tired because he has been running. The classroom is noisy as the students have been practicing a play. 3. To emphasize how long an action has been happening Commonly used with for and since. Example: I have been waiting for the bus for thirty minutes. We have been working in this school since 2018.

Use of Future Perfect Tense 1. To show an action that will be completed before a specific time in the future It indicates completion of an action ahead of a future deadline. Example: I will have completed the syllabus by March. She will have finished her homework before dinner. 2. To show an action that will be completed before another future action Example: The students will have entered the classroom before the bell rings. He will have left the office before the meeting starts. 3. To express assumptions or expectations about completed actions in the future Example: By now, they will have reached the station. She will have received the message by evening. 4. To indicate duration up to a certain point in the future Often used with for and by. Example: By next year, he will have worked here for ten years. By June, we will have taught this class for six months.