ViDL is a free Mac app that allows you to easily download videos from YouTube and hundreds of other websites for offline viewing.
It is based on the popular youtube-dl command line tool, but much easier to use, especially with videos/playlists that require a login (like your personal "Watch Later" list).
ViDL includes a browser extension for Safari, and a bookmarklet for other browsers, so you can download a video directly from a page you're viewing.
Some videos or playlists require a login before you can view or download them. ViDL can use login sessions (cookies) from an integrated web browser, so you can log in to e.g. YouTube to download your personal Watch Later list, private videos, etc.
You can easily download entire playlists from YouTube (just enter the playlist URL), or pick and choose from the list of thumbnails.
ViDL can optionally extract the audio track from any video you download (or, depending on the website, only download audio, e.g. from SoundCloud).
Simply downloading the is not enough. Here is a 4-week study plan based on Krohn’s own recommendations:
Unlike modern textbooks that can feel cluttered, Krohn focuses on an . This method is designed to help students transition from basic understanding to automatic, fluent speech.
: While designed for intermediate students, its structured layout makes it incredibly useful for advanced students seeking to correct deeply ingrained oral errors. Core Structural Breakdown of the Book
2. Key Components of "English Sentence Structure" by Robert Krohn englishsentencestructurerobertkrohnpdf new
The genius of the text lies in its highly technical, step-by-step scaffolding. Rather than introducing tenses abstractly, the textbook introduces structural items based on spatial and functional complexity. Phase & Lesson Groups Focus Grammatical Structures Practical Application / Example (Lessons 1–9)
is its , where each lesson in the book is specifically paired with a lesson in a "pattern practice" book to provide additional written and oral reinforcement. Other notable features include:
If you are looking for a colorful textbook with modern illustrations and "fun" icebreakers, English Sentence Structure Simply downloading the is not enough
If you are looking for information on , this comprehensive guide explores the core methodologies of Krohn’s work, how its structural approach accelerates language fluency, what to expect from modern digital versions (PDFs), and how to maximize its time-tested strategies for language mastery. Key Information Overview
In conclusion, whether you are using the classic printed volume or a new PDF edition, English Sentence Structure by Robert Krohn remains one of the most effective resources for mastering the English language. Its focus on practical application and pattern recognition ensures that learners do not just "know" English grammar, but can actually speak and write with confidence and accuracy. If you'd like to dive deeper, let me know if you want:
How does Krohn's work stack up against other popular grammar texts? : While designed for intermediate students, its structured
: While primarily optimized for intermediate learners, the textbook functions as an excellent oral remedial tool for advanced speakers who still make baseline syntax errors. Core Structure of the Textbook
The hallmark of Krohn’s work is its use of and oral drills. The book focuses on the "Michigan Rainbow" style of teaching, which emphasizes:
Originally published in 1971 by the University of Michigan Press, English Sentence Structure is part of the classic "Michigan Rainbow series." It has since become a cornerstone resource for English as a Second Language (ESL) instructors and self-learners alike.