What is the present perfect continuous tense? Give an example sentence.

What is the present perfect continuous tense? Give an example sentence.

The present perfect continuous tense is used to describe an action that started in the past, is still ongoing in the present, and may continue into the future. It is formed by using the present tense of "have" (have/has) followed by been and the present participle (-ing form) of the main verb.

Example sentence: "I have been studying for three hours."