The Controlled Natural Language of Randall Munroe's Thing Explainer [pdf]
I thought Thing Explainer is a fun experiment and a delightful book, but as an attempt (and it isn't a serious attempt) to use only simple and super-commonly-used language, it doesn't hit the home base. As I speak English as my second language I'm acutely aware of this.Thing explainer uses the 1000 most commonly used lemmas, but words have multiple senses, and some of them are commonly used and some are not. From a viewpoint of a language learner, an unfamiliar use of a word might be another word for what it's worth. (Of course they might have a clear semantical connection, which helps guessing.)Another thing is that phrasal verbs and set phrases are essentially vocabulary items too – you can't decode them using only extralinguistic knowledge (that is, knowledge about the world).Randall Munroe developed a text editor that highlights any words outside his word list to help with writing the book, but I think an editor that could handle word senses and multi-word phrases would be a formidable thing. Of course it needs much more high-level NLP, word sense disambiguation and such. (Possibly impossible to pull that off cleanly with the current level of tech?) I'd love to see one.