In this paper soo pro-form replacement sentences in Japanese are examined. There are two types of sentences containing the pro-form. One is where the pro-form substitutes for a clausal complement as in Hanako-wa soo omotteiru "Hanako thinks so," and the other is a sentence where the pro-form is followed by the copula da, as in John-mo soo da "John did so, too." Sakamoto (2016) gives a PF deletion analysis to the clausal complement sentences and accounts for the fact that only A-movement is

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... ed from the ellipsis site by following Bošković's (2014) derivational approach to ellipsis. We will discuss some new data that appear to pose a problem for Sakamoto's analysis and offer a solution to that problem. Then, we will also show that extension of his analysis to the second type of soo replacement sentences is not tenable.