The Bottleneck Hypothesis argues that properties of inflectional morphology explain why second-language learners may face persistent difficulties in articulating meaning in target-language forms. In particular, the acquisition task proves even harder when first and second languages differ in the way they organize the mapping of functional features…

In the French verb phrase, negation is often marked twice, by a proclitic element (ne) and by a second negative (such as "pas" or "rien"). Until the seventeenth century, the first element was obligatory, while a second negative was optionally added for emphasis or precision. Subsequently, the second negatives lost their…