Since Chomsky (1999), it has been known that Thematization/Extraction (henceforth, TH/EX) involves a lot of syntactic and phonological phenomena. Some of the characteristics of TH/EX are arguably the following: TE/EX can be leftward or rightward. TH/EX does not yield the usual surface semantic effects. TH/EX is an operation of the phonological component. TH/EX is incompatible with independent movement of the extracted nominal. And TH/EX applies at a weak phase only, etc. In this paper, I have pointed out along with Radford (2000) that TH/EX is not a single operation, but are different operations, the former leftward, the latter rightward. Contrary to Chomsky``s (1999) suggestion that TH/EX is regarded as applying in the phonological component, I have argued that TH is a syntactic operation from the observation that when TH is applied, it yields the surface semantic effect of TOPIC. The argument also comes from the fact that there are syntactic operations which do not yield surface semantic effects on the one hand, and that some phonological operations yield surface semantic effects, on the other hand. I have also suggested that Expletive Unaccusatives and Expletive Passive Constructions are themselves intervention elements in Wh-movement. Finally, under the general agreement that EX is a phonological operation, I have suggested that EX can be reduced eventually to Heavy NP Shift.