I may have an older answer key that has been corrected, or maybe I'm just not thinking correctly. Chapter 8, Exercises for Day 4, #24: Is 'John is large' wholly inseparable? If so, why? It seems to me it should be partially separable.
Also, how are the actions in 'John is reading' (PS) and 'John is running' (WS) different? My answer key's answers in parenthesis.