Jean-Yves Pollock's article explores the differences between French and English in syntax, particularly in sentence negation, questions, adverbs, floating quantifiers, and quantification at a distance. He argues that these differences can be explained by the structure of Universal Grammar (UG) and a parameter related to the "opacity" or "transparency" of Agr(eement) in the two languages. Pollock suggests that both French and English have a maximal projection NegP, which can act as a barrier for certain types of movements. He also proposes that the structure of IP is more complex than previously thought, with Infl(ection) not being a single constituent but rather two separate heads, AgrP and IP (or T(ense)P). The Empty Category Principle (ECP), θ-theory, and quantification theory are used to explain the syntax of negation, questions, adverbs, and floating quantifiers in both languages. Pollock shows that the "opacity" of Agr in Modern English leads to specific syntactic behaviors, while French is more transparent. The article also discusses verb movement in infinitives, showing that French and English have similar patterns but with some differences in adverb and quantifier placement. Pollock concludes that the lexical restrictions on verb movement in English are not idiosyncratic but are related to the opacity of Agr and the structure of IP. The article provides a detailed analysis of the syntax of both languages and offers a unified account of the differences between them.Jean-Yves Pollock's article explores the differences between French and English in syntax, particularly in sentence negation, questions, adverbs, floating quantifiers, and quantification at a distance. He argues that these differences can be explained by the structure of Universal Grammar (UG) and a parameter related to the "opacity" or "transparency" of Agr(eement) in the two languages. Pollock suggests that both French and English have a maximal projection NegP, which can act as a barrier for certain types of movements. He also proposes that the structure of IP is more complex than previously thought, with Infl(ection) not being a single constituent but rather two separate heads, AgrP and IP (or T(ense)P). The Empty Category Principle (ECP), θ-theory, and quantification theory are used to explain the syntax of negation, questions, adverbs, and floating quantifiers in both languages. Pollock shows that the "opacity" of Agr in Modern English leads to specific syntactic behaviors, while French is more transparent. The article also discusses verb movement in infinitives, showing that French and English have similar patterns but with some differences in adverb and quantifier placement. Pollock concludes that the lexical restrictions on verb movement in English are not idiosyncratic but are related to the opacity of Agr and the structure of IP. The article provides a detailed analysis of the syntax of both languages and offers a unified account of the differences between them.