In this paper, we will argue that the LF Object Shift analysis of the infin
ite regress resolution of Antecedent Contained Deletion is untenable concep
tually and empirically. Generalizing Baltin's (1987) CP Extraposition analy
sis, we will instead propose that any type of rightward movement, including
NP and PP Rightward Shift, is available for the infinite regress resolutio
n. Furthermore, wider range of data than the LF Object Shift analysis. Fina
lly, we will address a question as to why rightward movement, which is non-
feature checking movement, is triggered/involved in Antecedent Contained De
letion. We will suggest a way to derive this property under the assumptions
of Chomsky's (1993, 1995) Minimalist Program.