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the tree structure for this sentence, [He_i would like PRO_i to stay], and shows PRO surfacing in the specifier position of the TP in the embedded clause, and co-referenced to (referring to the same being as) the subject of the matrix clause. We can interpret this as the DP subject [He] having control over PRO. In other words, the meaning of PRO is determined by the meaning of DP [He], as they are co-referenced. This is an example of a subject control construction, where the pronominal subject [He] is selected for by both

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