This study presents a corpus-based analysis of the use of ?wh? sentences by language learners, in language textbooks and in authentic written discourse. It focuses on the polysemeous nature of ?wh? words, which can be used as interrogatives, declaratives and to introduce subordinate clauses. The analysis of ?wh? sentences in EFL textbooks showed that there are more prototypical examples at low proficiency levels. When teaching the interrogative, textbooks...