| Resource | Format | Cost | Level | |----------|--------|------|-------| | | Website & App | Free | A1 to C2 | | Khan Academy – Grammar | Video + exercises | Free | A2 to B2 | | OpenStax – Writing Guide | PDF (legal) | Free | B1 to C1 | | Duolingo | App | Free (ads) | A1 to B2 | | LibriVox | Audiobooks (public domain) | Free | B1+ | | English Grammar in Use (Raymond Murphy) | PDF (sample chapters free) | Low cost | B1 to B2 |
: Sites like Scribd host various student guides, homework resources, and teacher guides for W2 , W4 , W8 , and W12 .
