This paper inquires into the inability ofsubjects in English to topicalise. Treatingtopicalisation as a specific case of d-linking,it asks: why don’t subjects topicalise inEnglish? And why cannot they be d-linkedthrough further movement? It concludes thatthe property of [aboutness] of subjects is anunderspecified instance of a more compositederivative effect realised as [topic]. Giventhe ability of objects in English to be readilyd-linked through extraction in CP, theanalysis takes a detailed look at the structuraldifferences between subjects and objects. Itconcludes that d-linking of an (...) argument iscontingent upon the derivational memory ofits prior inclusion within vP that has yielded itsdenotational set-membership. Treating EPPas an A’-operation that embeds one instance ofthe subject-chain into discourse, the inabilityof subjects to topicalise is explained as an “online”denotational dependency on discourse,which lacks the systemic memory of thesubject’s embedding. In turn, their immobilityis treated as a modular dependency betweenthe two subject copies, mediated through Texcluding the one instance of the chain. (shrink)