| Feature | Krohn 2021 PDF | Murphy | Azar | |--------|----------------|---------|------| | Focus on sentence structure | | Secondary | Moderate | | Transformational drills | Extensive | None | Some | | Digital format (searchable) | Yes | Limited | Yes | | Corpus-based examples (2010–2020) | Yes | No (older) | Partial | | Price | Often free/affordable (via university libraries) | Retail | Retail |
Krohn identifies several essential patterns used to build every sentence: John sleeps. (Intransitive) S-V-O: John reads a book. (Transitive) S-LV-C: John is a teacher. (Linking verb + Complement)
The storm raged. Lightning flashed. The old house stood alone on the hill. It waited.