I look at the whole question in a rather simplistic way. look up is, as you say, a phrasal verb (I call them 2-word verbs). The fact that the object pronoun comes between the two parts makes no difference.
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AnonymousIs that correct, or does 'up' become its own Prepositional Phrase within the Verb phrase?It may depend on the details of the system of analysis you are following. I'm inclined to go with Radford and have 'up' become a PP in that context.
Anonymouscould not find the respective explanation.Hmm. That's strange. See page 100, example 163, and look back at example 125, as the author suggests, for the comparison. Briefly, as I understood it in a quick reread, the difference has to do with where modifiers can go -- none are grammatical before the P if the P comes directly after the V, but some ar