The lexical mapping of abstract functional words like modal verbs is an open problem in acquisition (e.g., Gleitman et al. 2005). In diachronic linguistics it has been proposed that learner mapping errors are responsible for innovations in the historical record (see Kiparsky 1974; Roberts & Roussou 2003, among others). This suggests that child…

Examines how second-language learners compensate for their target language deficiency in communication using the One to One Principle of interlanguage communication. Results indicate that target language aspects not adhering to one-to-one mapping between semantic and surface elements are problematic to the learners and are seemingly acquired late.…