Optionality and overgeneralisation patterns in second language acquisition: Where has the expletive ensconced «it»self?

This book discusses the nature of optionality in second language grammars. For these purposes, experimental data from 213 learners of German and 150 learners of Russian across four levels of acquisition has been collected and analysed. The object of inquiry is the acquisition of various impersonal constructions, as well as argument licensing.