I have summarized the document in 3 sentences: The document provides 10 sentences to rewrite using the present perfect or present perfect continuous tenses, including examples such as discussing a research proposal, studying English, learning to play the piano, attending online courses, visiting a college, reading a book, doing a research project, building a campus, cancelling a picnic due to rain, and staying at a homestay during an undergraduate program. The rewritten sentences are meant to practice transforming sentences describing ongoing or repeated actions that started in the past and continue in the present using the appropriate present perfect or present perfect continuous verb tenses.