| Present Perfect Continuous Tense shows that an action started in the past and still running in the present moment. | Past Perfect Continuous Tense shows that a running action happened at a specific time in the past. |
| The running action may not finish in Present Perfect Continuous tense. | The running action finished in Past Perfect Continuous tense. |
| In Present Perfect Continuous tense, it makes a relationship between the present and past moment with measuring duration. | In Past Perfect Continuous tense, it focuses only past moment with measuring duration. |
| Have/Has been and present progressive verb use in Present Perfect Continuous tense. | Had been and present progressive verb use in Past Perfect Continuous tense. |
| Example: a) He has been walking for two hours. b) We have been waiting here since morning. | Example: a) He had been reading different kinds of books since morning. b) I had been writing articles on various topics for three hours. |
