Typical headed relatives in English include a relative pronoun which takes the head as its antecedent. However, some modifying when-clauses in this language are peculiar relatives in that their heads are not the antecedent of when and they do not even have temporal referents. In view of the peculiarity of this type of relative clause, a novel account of the syntactic generation and interpretation of temporal when-clauses is pro- posed. Under this account four lexical entries of when, which have different semantic and syntactic properties, are recognized. The semantics of various whens are analyzed based on existing work, while the syntactic properties of different whens in non-interrogative sentences are characterized in the form of lexical information, which is implemented in the framework of Dynamic Syntax. The work in this article enriches the description of the diversity of relatives and suggests that the analysis of relatives can be unified semantically but not syntactically.
