In this lesson, we'll delve into the perfect continuous tenses in English. The core concept of perfect continuous tense refers to continuing to do something until a certain point in time. The perfect continuous tense includes present perfect continuous tense, past perfect continuous tense, and future perfect continuous tense. In this lesson, we'll go through various examples and usage scenarios of perfect tenses. We are confident that by the end, you'll have a much clearer understanding of this grammatical concept.